AAP-80457 - Fix credential_input_source to handle state: absent when target crede… (#16523)

Fix credential_input_source to handle state: absent when target credential is missing

The credential_input_source module would error when trying to delete a
credential input source (state: absent) if the target credential didn't
exist. This breaks idempotent playbook runs where cleanup tasks assume
resources may already be gone.

The fix only applies to state: absent; state: present still correctly
fails when the target credential doesn't exist.

Co-authored-by: Liam Allen <lallen@redhat.com>

awx_collection/plugins/modules/credential_input_source.py

@@ -93,7 +93,15 @@ def main():
     metadata = module.params.get('metadata')
     state = module.params.get('state')
 
-    target_credential_id = module.resolve_name_to_id('credentials', target_credential)
+    # The target credential lookup should not fail if the target credential is absent and the
+    # state on the credential input source is also absent. If the credential input source has a
+    # state of present, then this should fail as the target credential cannot be nonexistent.
+    target_credential_lookup = module.get_one('credentials', name_or_id=target_credential, allow_none=(state == 'absent'))
+
+    if target_credential_lookup is None:
+        module.exit_json(**{'changed': False})
+    else:
+        target_credential_id = target_credential_lookup['id']
 
     # Attempt to look up the object based on the target credential and input field
     lookup_data = {