Merge branch 'master' into develop

synapse/app/homeserver.py

@@ -234,7 +234,7 @@ def setup():
     except UpgradeDatabaseException:
         sys.stderr.write(
             "\nFailed to upgrade database.\n"
-            "Have you followed any instructions in UPGRADES.rst?\n"
+            "Have you checked for version specific instructions in UPGRADES.rst?\n"
         )
         sys.exit(1)
 

synapse/media/v1/base_resource.py

@@ -139,6 +139,7 @@ class BaseMediaResource(Resource):
             @download.addBoth
             def callback(media_info):
                 del self.downloads[key]
+                return media_info
         return download
 
     @defer.inlineCallbacks