workflow_job_template: not accepting empty value for execution_environment

[kk-at-redhat]

Please confirm the following

• I agree to follow this project's code of conduct.
• I have checked the current issues for duplicates.
• I understand that AWX is open source software provided for free and that I might not receive a timely response.
• I am NOT reporting a (potential) security vulnerability. (These should be emailed to security@ansible.com instead.)

Bug Summary

which would be required to remove the setting

AWX version

4.6.7

Select the relevant components

• UI
• UI (tech preview)
• API
• Docs
• Collection
• CLI
• Other

Installation method

docker development environment

Modifications

no

Ansible version

2.15.13

Operating system

RHEL9

Web browser

No response

Steps to reproduce

ansible -m ansible.controller.workflow_job_template -a '{"name": "Workflow B", "workflow_nodes": [{"identifier": "1ca40111-f92b-435e-bff2-b33edd455941", "unified_job_template": {"name": "Template C", "type": "job_template"}, "execution_environment": {"name": "B"}}]}' localhost

localhost | CHANGED => {
"changed": true,
"id": 18,
"node_creation_data": [
.....

ansible -m ansible.controller.workflow_job_template -a '{"name": "Workflow B", "workflow_nodes": [{"identifier": "1ca40111-f92b-435e-bff2-b33edd455941", "unified_job_template": {"name": "Template C", "type": "job_template"}, "execution_environment": ""}]}' localhost

Expected results

localhost | CHANGED => {
"changed": true,
"id": 18,
"node_creation_data": [
.....

Actual results

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: TypeError: string indices must be integers
localhost | FAILED! => {
"changed": false,
"module_stderr": "Traceback (most recent call last):\n File "/home/kk/.ansible/tmp/ansible-tmp-1739571446.1771965-1394-84107872128117/AnsiballZ_workflow_job_template.py", line 107, in \n _ansiballz_main()\n File "/home/kk/.ansible/tmp/ansible-tmp-1739571446.1771965-1394-84107872128117/AnsiballZ_workflow_job_template.py", line 99, in _ansiballz_main\n invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\n File "/home/kk/.ansible/tmp/ansible-tmp-1739571446.1771965-1394-84107872128117/AnsiballZ_workflow_job_template.py", line 47, in invoke_module\n runpy.run_module(mod_name='ansible_collections.ansible.controller.plugins.modules.workflow_job_template', init_globals=dict(_module_fqn='ansible_collections.ansible.controller.plugins.modules.workflow_job_template', _modlib_path=modlib_path),\n File "/usr/lib64/python3.9/runpy.py", line 225, in run_module\n return _run_module_code(code, init_globals, run_name, mod_spec)\n File "/usr/lib64/python3.9/runpy.py", line 97, in _run_module_code\n _run_code(code, mod_globals, init_globals,\n File "/usr/lib64/python3.9/runpy.py", line 87, in _run_code\n exec(code, run_globals)\n File "/tmp/ansible_ansible.controller.workflow_job_template_payload_vo7mnbkq/ansible_ansible.controller.workflow_job_template_payload.zip/ansible_collections/ansible/controller/plugins/modules/workflow_job_template.py", line 1016, in \n File "/tmp/ansible_ansible.controller.workflow_job_template_payload_vo7mnbkq/ansible_ansible.controller.workflow_job_template_payload.zip/ansible_collections/ansible/controller/plugins/modules/workflow_job_template.py", line 1007, in main\n File "/tmp/ansible_ansible.controller.workflow_job_template_payload_vo7mnbkq/ansible_ansible.controller.workflow_job_template_payload.zip/ansible_collections/ansible/controller/plugins/modules/workflow_job_template.py", line 658, in create_workflow_nodes\nTypeError: string indices must be integers\n",
"module_stdout": "",
"msg": "MODULE FAILURE\nSee stdout/stderr for the exact error",
"rc": 1
}

Additional information

No response