fix: do not crash the event emitting parent process if on listener fails

[SebastianKrupinski]

• Resolves:

• Constructor Errors
  TypeError: OCA\Talk\Listener\CalDavEventListener::__construct(): Argument Add a thumbnail/grid view to the Files app #6 ($userId) must be of type string, null given
  #26 /spreed/lib/Listener/CalDavEventListener.php(32): OCA\Talk\Listener\CalDavEventListener::__construct

• Execution Errors
  ErrorException: Warning: Attempt to read property "LOCATION" on null
  Add drone.io support #17 /spreed/lib/Listener/CalDavEventListener.php(68): OCA\Talk\Listener\CalDavEventListener::handle

Summary

• Overrides the Symfony dispatcher call listener function to catch and log errors with event listeners without crashing the entire parent process

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)