interface: close wire is response is not dict

lib/interface.py

@@ -313,8 +313,9 @@ class Interface(util.PrintError):
                 response = self.pipe.get()
             except util.timeout:
                 break
-            if response is None:
+            if not type(response) is dict:
                 responses.append((None, None))
+                if response is None:
                     self.closed_remotely = True
                     self.print_error("connection closed remotely")
                 break