Merge pull request #939 from taigaio/fix-warning-on-some-malformed-requests

Avoid problems with some malformed requests

taiga/projects/history/mixins.py

@@ -59,6 +59,8 @@ class HistoryResourceMixin(object):
         """
 
         user = self.request.user
+        comment = ""
+        if isinstance(self.request.DATA, dict):
             comment = self.request.DATA.get("comment", "")
 
         if obj is None: