Added missing requirement.

fix #2510

modoboa/lib/api_client.py

@@ -86,6 +86,7 @@ class ModoAPIClient(object):
             logger.critical(
                 _("Failed to communicate with public API: %s"), str(err)
             )
+            return
         if response.status_code != 200:
             logger.critical(
                 _("Failed to communicate with public API: %s"), response.text

requirements.txt

@@ -16,6 +16,7 @@ djangorestframework-simplejwt==5.1.0
 passlib~=1.7.4
 bcrypt  # Requires libffi-dev and python-dev
 
+asgiref
 dnspython==2.2.1
 feedparser==6.0.8
 greenlet==1.1.2