get_master_client(): don't crash on ssl connections

redis_cache/backends/base.py

@@ -172,7 +172,7 @@ class BaseRedisCache(BaseCache):
             kwargs['host'],
             kwargs['port'],
             kwargs['db'],
-            kwargs['unix_socket_path'],
+            kwargs['unix_socket_path'] if not kwargs.get('ssl', False) else None,
         )]
 
     def create_client(self, server):