code cleanup

mainly removes throw statements

automated using Android Studio, staged by hand

BUILD SUCCESSFUL in 52s
39 actionable tasks: 37 executed, 2 up-to-date

app/src/main/java/org/schabi/newpipe/util/ExtractorHelper.java

@@ -183,7 +183,7 @@ public final class ExtractorHelper {
             cache.removeInfo(serviceId, url);
             load = loadFromNetwork;
         } else {
-            load = Maybe.concat(ExtractorHelper.<I>loadFromCache(serviceId, url),
+            load = Maybe.concat(ExtractorHelper.loadFromCache(serviceId, url),
                     loadFromNetwork.toMaybe())
                     .firstElement() //Take the first valid
                     .toSingle();