fix the tower_user module to update the fields properly

awx_collection/plugins/modules/tower_user.py

@@ -149,19 +149,19 @@ def main():
 
     # Create the data that gets sent for create and update
     new_fields = {}
-    if username:
+    if username is not None:
         new_fields['username'] = module.get_item_name(existing_item) if existing_item else username
-    if first_name:
+    if first_name is not None:
         new_fields['first_name'] = first_name
-    if last_name:
+    if last_name is not None:
         new_fields['last_name'] = last_name
-    if email:
+    if email is not None:
         new_fields['email'] = email
-    if is_superuser:
+    if is_superuser is not None:
         new_fields['is_superuser'] = is_superuser
-    if is_system_auditor:
+    if is_system_auditor is not None:
         new_fields['is_system_auditor'] = is_system_auditor
-    if password:
+    if password is not None:
         new_fields['password'] = password
 
     # If the state was present and we can let the module build or update the existing item, this will return on its own

awx_collection/test/awx/test_user.py

@@ -57,3 +57,24 @@ def test_update_password_on_create(run_module, admin_user, mock_auth_stuff):
         assert not result.get('failed', False), result.get('msg', result)
 
     assert not result.get('changed')
+
+
+@pytest.mark.django_db
+def test_update_user(run_module, admin_user, mock_auth_stuff):
+    result = run_module('tower_user', dict(
+        username='Bob',
+        password='pass4word',
+        is_system_auditor=True
+    ), admin_user)
+    assert not result.get('failed', False), result.get('msg', result)
+    assert result.get('changed'), result
+
+    update_result =     result = run_module('tower_user', dict(
+        username='Bob',
+        password='pass4word',
+        is_system_auditor=False
+    ), admin_user)
+
+    assert update_result.get('changed')
+    user = User.objects.get(id=result['id'])
+    assert not user.is_system_auditor