Merge pull request #471 from lbryio/fix-delete-lbry-file

fix file_delete

CHANGELOG.md

@@ -14,6 +14,7 @@ at anytime.
  * fix recursion depth error upon failed blob
  * call stopProducing in reflector client file_sender when uploading is done
  * ensure streams in stream_info_manager are saved in lbry_file_manager
+ * [#470](https://github.com/lbryio/lbry/issues/470)
 
 ## [0.8.1] - 2017-02-01
 ### Changed

lbrynet/lbryfilemanager/EncryptedFileManager.py

@@ -281,8 +281,10 @@ class EncryptedFileManager(object):
 
     @rerun_if_locked
     def _get_count_for_stream_hash(self, stream_hash):
-        return self.sql_db.runQuery("select count(*) from lbry_file_options where stream_hash = ?",
+        d = self.sql_db.runQuery("select count(*) from lbry_file_options where stream_hash = ?",
                                      (stream_hash,))
+        d.addCallback(lambda r: (r[0][0] if r else 0))
+        return d
 
     @rerun_if_locked
     def _get_rowid_for_stream_hash(self, stream_hash):