fixed issue with file history for new added files

rhodecode/controllers/files.py

@@ -155,7 +155,11 b' class FilesController(BaseRepoController'
 
             if c.file.is_file():
                 _hist = c.rhodecode_repo.get_changeset().get_file_history(f_path)
-                c.file_changeset = c.changeset if c.changeset.revision < _hist[0].revision else _hist[0]
+                c.file_changeset = c.changeset
+                if _hist:
+                    c.file_changeset = (c.changeset 
+                                        if c.changeset.revision < _hist[0].revision
+                                        else _hist[0])
                 c.file_history = self._get_node_history(None, f_path, _hist)
                 c.authors = []
                 for a in set([x.author for x in _hist]):