backends: make sure the NoNode error uses safe representation of path

to avoide unicode errors.

rhodecode/lib/vcs/backends/base.py

@@ -1065,8 +1065,8 b' class BaseCommit(object):'
 
     def no_node_at_path(self, path):
         return NodeDoesNotExistError(
-            "There is no file nor directory at the given path: "
-            "'%s' at commit %s" % (path, self.short_id))
+            u"There is no file nor directory at the given path: "
+            u"'%s' at commit %s" % (safe_unicode(path), self.short_id))
 
     def _fix_path(self, path):
         """