Detects the return value and returns None if the return value is empty (

ansible-collections#1483)

plugins/modules/azure_rm_gallery_info.py

@@ -231,6 +231,8 @@ def list(self):
         return [self.format_item(x) for x in results['value']] if results['value'] else []
 
     def format_item(self, item):
+        if not item:
+            return
         d = {
             'id': item['id'],
             'name': item['name'],