postgresql_server handler to restart postgreql fails when postgresql_server__version is empty. #393

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Bug description

Hi
When I use postgresql_server, I get an error like:
FAILED! => {"changed": false, "msg": "Could not find the requested service postgresql-: host"}
with the minus added to the service name. This seems to happen, when postgresql_server__version is empty and the handler to restart the postgresql service is called.
A workaround is to set lfops__skip_restart_handlers: true.

Steps to reproduce

Run the task without a value for postgresql_server__version.

Expected behavior

No response

Environment

RockyLinux 10.2 and running Ansible from AWX.

Additional context

No response