Fixed exceptions as requested

src/main/java/org/schabi/newpipe/extractor/services/soundcloud/SoundcloudStreamExtractor.java

@@ -148,12 +148,12 @@ public class SoundcloudStreamExtractor extends StreamExtractor {
     }
 
     @Override
-    public List<Subtitles> getSubtitlesDefault() throws IOException, ExtractionException, JsonParserException {
+    public List<Subtitles> getSubtitlesDefault() throws IOException, ExtractionException {
         return null;
     }
 
     @Override
-    public List<Subtitles> getSubtitles(SubtitlesFormat format) throws IOException, ExtractionException, JsonParserException {
+    public List<Subtitles> getSubtitles(SubtitlesFormat format) throws IOException, ExtractionException {
         return null;
     }
 

src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeStreamExtractor.java

@@ -380,19 +380,25 @@ public class YoutubeStreamExtractor extends StreamExtractor {
     }
 
     @Override
-    public List<Subtitles> getSubtitlesDefault() throws IOException, ExtractionException, JsonParserException {
+    public List<Subtitles> getSubtitlesDefault() throws IOException, ExtractionException {
         return getSubtitles(SubtitlesFormat.TTML);
     }
 
     @Override
-    public List<Subtitles> getSubtitles(SubtitlesFormat format) throws IOException, ExtractionException, JsonParserException {
+    public List<Subtitles> getSubtitles(SubtitlesFormat format) throws IOException, ExtractionException {
         JsonObject playerConfig = getPlayerConfig(getPageHtml());
         String playerResponse = playerConfig.getObject("args").getString("player_response");
 
-        // Captions does not exist, return null
+        JsonObject captions;
-        if (!JsonParser.object().from(playerResponse).has("captions")) return null;
+        try {
+            // Captions does not exist, return null
+            if (!JsonParser.object().from(playerResponse).has("captions")) return null;
 
-        JsonObject captions = JsonParser.object().from(playerResponse).getObject("captions");
+            captions = JsonParser.object().from(playerResponse).getObject("captions");
+        } catch (JsonParserException e) {
+            // Failed to parse subtitles
+            return null;
+        }
         JsonArray captionsArray = captions.getObject("playerCaptionsTracklistRenderer").getArray("captionTracks");
 
         int captionsSize = captionsArray.size();

src/main/java/org/schabi/newpipe/extractor/stream/StreamExtractor.java

@@ -112,9 +112,8 @@ public abstract class StreamExtractor extends Extractor {
     public abstract List<AudioStream> getAudioStreams() throws IOException, ExtractionException;
     public abstract List<VideoStream> getVideoStreams() throws IOException, ExtractionException;
     public abstract List<VideoStream> getVideoOnlyStreams() throws IOException, ExtractionException;
-    public abstract List<Subtitles> getSubtitlesDefault() throws IOException, ExtractionException, JsonParserException;
+    public abstract List<Subtitles> getSubtitlesDefault() throws IOException, ExtractionException;
-
+    public abstract List<Subtitles> getSubtitles(SubtitlesFormat format) throws IOException, ExtractionException;
-    public abstract List<Subtitles> getSubtitles(SubtitlesFormat format) throws IOException, ExtractionException, JsonParserException;
 
     public abstract StreamType getStreamType() throws ParsingException;
     public abstract StreamInfoItem getNextVideo() throws IOException, ExtractionException;

src/test/java/org/schabi/newpipe/extractor/services/soundcloud/SoundcloudStreamExtractorDefaultTest.java

@@ -107,13 +107,13 @@ public class SoundcloudStreamExtractorDefaultTest {
     }
 
     @Test
-    public void testGetSubtitlesListDefault() throws IOException, ExtractionException, JsonParserException {
+    public void testGetSubtitlesListDefault() throws IOException, ExtractionException {
         // Video (/view?v=YQHsXMglC9A) set in the setUp() method has no captions => null
         assertTrue(extractor.getSubtitlesDefault() == null);
     }
 
     @Test
-    public void testGetSubtitlesList() throws IOException, ExtractionException, JsonParserException {
+    public void testGetSubtitlesList() throws IOException, ExtractionException {
         // Video (/view?v=YQHsXMglC9A) set in the setUp() method has no captions => null
         assertTrue(extractor.getSubtitles(SubtitlesFormat.VTT) == null);
     }

src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubeStreamExtractorDefaultTest.java

@@ -149,13 +149,13 @@ public class YoutubeStreamExtractorDefaultTest {
     }
 
     @Test
-    public void testGetSubtitlesListDefault() throws IOException, ExtractionException, JsonParserException {
+    public void testGetSubtitlesListDefault() throws IOException, ExtractionException {
         // Video (/view?v=YQHsXMglC9A) set in the setUp() method has no captions => null
         assertTrue(extractor.getSubtitlesDefault() == null);
     }
 
     @Test
-    public void testGetSubtitlesList() throws IOException, ExtractionException, JsonParserException {
+    public void testGetSubtitlesList() throws IOException, ExtractionException {
         // Video (/view?v=YQHsXMglC9A) set in the setUp() method has no captions => null
         assertTrue(extractor.getSubtitles(SubtitlesFormat.VTT) == null);
     }

src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubeStreamExtractorRestrictedTest.java

@@ -108,13 +108,13 @@ public class YoutubeStreamExtractorRestrictedTest {
 
 
     @Test
-    public void testGetSubtitlesListDefault() throws IOException, ExtractionException, JsonParserException {
+    public void testGetSubtitlesListDefault() throws IOException, ExtractionException {
         // Video (/view?v=YQHsXMglC9A) set in the setUp() method has no captions => null
         assertTrue(extractor.getSubtitlesDefault() == null);
     }
 
     @Test
-    public void testGetSubtitlesList() throws IOException, ExtractionException, JsonParserException {
+    public void testGetSubtitlesList() throws IOException, ExtractionException {
         // Video (/view?v=YQHsXMglC9A) set in the setUp() method has no captions => null
         assertTrue(extractor.getSubtitles(SubtitlesFormat.VTT) == null);
     }