Merge pull request #4553 from mmoya/features

Do key validation only when key is provided

library/packaging/apt_key

@@ -188,6 +188,7 @@ def main():
     state           = module.params['state']
     changed         = False
 
+    if key_id:
         try:
             _ = int(key_id, 16)
             key_id = key_id.lstrip('0x')