FIx #928 - don't raise an exception in case of unsupported archive

libs/subliminal_patch/providers/subssabbz.py

@@ -188,4 +188,5 @@ class SubsSabBzProvider(Provider):
         elif is_zipfile(archive_stream):
             return self.process_archive_subtitle_files( ZipFile(archive_stream), language, video, link )
         else:
-            raise ValueError('Not a valid archive')
+            logger.error('Ignore unsupported archive %r', request.headers)
+            return []

libs/subliminal_patch/providers/subsunacs.py

@@ -196,4 +196,5 @@ class SubsUnacsProvider(Provider):
         elif is_zipfile(archive_stream):
             return self.process_archive_subtitle_files( ZipFile(archive_stream), language, video, link )
         else:
-            raise ValueError('Not a valid archive')
+            logger.error('Ignore unsupported archive %r', request.headers)
+            return []

libs/subliminal_patch/providers/yavkanet.py

@@ -175,5 +175,5 @@ class YavkaNetProvider(Provider):
         elif is_zipfile(archive_stream):
             return self.process_archive_subtitle_files( ZipFile(archive_stream), language, video, link )
         else:
-            raise ValueError('Not a valid archive')
+            logger.error('Ignore unsupported archive %r', request.headers)
-        
+            return []