fixed the raise of KeyError since all values are None if unset

plugins/module_utils/module.py

@@ -96,10 +96,10 @@ class AnsibleModule(object):
 
     def get(self, key: str, default: T = None) -> T:
         """returns an Parameter of the Module."""
-        if key not in self.params:
-            raise KeyError()
         if self.params[key] is None and default is not None:
             return default
+        elif self.params[key] is None and default is None:
+            raise KeyError()
         return self.params[key]
 
     def changed_get(self):