Check_MK Werk 5268: cmk-update-agent: Improve exception handling

ID: 5268 Title: cmk-update-agent: Improve exception handling Component: agents Level: 1 Class: Bug fix Version: 1.5.0i3 Due to an inconsistent exception handling in cmk-update-agent program flow, the running program could exit before releasing its lock file. This could result in an error message <pre> ERROR An instance of cmk_update_agent.py is already running on this system. Aborting... </pre> when running cmk-update-agent again. If you are affected by this error, please delete the lock file "cmk-update-agent.pid", located at your system's or user's temp-dir, once manually.