fix crash in MediaUtils.getVideoThumbnail

app/src/main/java/com/keylesspalace/tusky/util/MediaUtils.kt

@@ -113,7 +113,15 @@ fun getImageThumbnail(contentResolver: ContentResolver, uri: Uri, @Px thumbnailS
 
 fun getVideoThumbnail(context: Context, uri: Uri, @Px thumbnailSize: Int): Bitmap? {
     val retriever = MediaMetadataRetriever()
-    retriever.setDataSource(context, uri)
+    try {
+        retriever.setDataSource(context, uri)
+    } catch (e: IllegalArgumentException) {
+        Log.w(TAG, e)
+        return null
+    } catch (e: SecurityException) {
+        Log.w(TAG, e)
+        return null
+    }
     val source = retriever.frameAtTime ?: return null
     return ThumbnailUtils.extractThumbnail(source, thumbnailSize, thumbnailSize, ThumbnailUtils.OPTIONS_RECYCLE_INPUT)
 }