Fix GitCommentHelpHandler not responding in monorepositories (#3048)

Fix GitCommentHelpHandler not responding in monorepositories

This is a simple fix of the issue below. The two edited methods attempt to retrieve package configs, which aren't needed for the help handler. There may be a more elegant solution.
Also, if there is a possibility that GithubAppInstallationHandler and GithubFasVerificationHandler are ever run in a monorepository, they would possibly be affected by the same issue.
This has been tested locally on a generated Fedora Messaging message generated from a comment, so it should hopefully work.
Fixes #3045

Reviewed-by: Matej Focko
Reviewed-by: Nikola Forró
Reviewed-by: Alžběta Kučerová
Reviewed-by: gemini-code-assist[bot]

Author: centosinfra-prod-github-app[bot]

packit_service/worker/handlers/abstract.py

@@ -464,7 +464,7 @@ def get_signature(cls, event: Event, job: Optional[JobConfig]) -> Signature:
                 "package_config": dump_package_config(
                     (
                         event.packages_config.get_package_config_for(job)
-                        if event.packages_config
+                        if job and event.packages_config
                         else None
                     ),
                 ),

packit_service/worker/result.py

@@ -37,7 +37,7 @@ def create_from(
     ):
         package_config = (
             event.packages_config.get_package_config_for(job_config)
-            if event.packages_config
+            if job_config and event.packages_config
             else None
         )
         details = {