Fixed opensubtitles.com exception when invalid JSON is returned from provider. #1572

libs/subliminal_patch/providers/opensubtitlescom.py

@@ -299,6 +299,8 @@ class OpenSubtitlesComProvider(ProviderRetryMixin, Provider):
 
         try:
             result = res.json()
+            if 'data' not in result:
+                raise ValueError
         except ValueError:
             raise ProviderError('Invalid JSON returned by provider')
         else: