Concurent issue when connection timeout is not defined

Author: sdefauw

asterisk/ami/response.py

@@ -70,9 +70,10 @@ def set_response(self, response):
             self._lock.release()
 
     def get_response(self):
+        self._lock.acquire()
         if self._response is not None:
+            self._lock.release()
             return self._response
-        self._lock.acquire()
         self._lock.wait(self._timeout)
         self._lock.release()
         return self._response