Fix: #1178 Left Pane is not shown when database contains table that n…

…ame has unicode characters (MSSQL)

- Update table_name to be unicode (not str).

redash/query_runner/mssql.py

@@ -92,7 +92,7 @@ def _get_tables(self, schema):
 
         for row in results['rows']:
             if row['table_schema'] != self.configuration['db']:
-                table_name = '{}.{}'.format(row['table_schema'], row['table_name'])
+                table_name = u'{}.{}'.format(row['table_schema'], row['table_name'])
             else:
                 table_name = row['table_name']