Handle check suite for first commit

The update provides a specific handler for a check suite in case of the first commit. Now, if the 'before' field of check suite equals to "0000000000000000000000000000000000000000", meaning it's the first commit, the code will set check run's title to "First commit", its conclusion to success, and then return.

[release:minor]

src/managers/release_manager.py

@@ -26,6 +26,9 @@ def manage(event: CheckSuiteRequestedEvent) -> None:
     version_to_release = None
     check_suite = event.check_suite
     is_default_branch = head_branch == repository.default_branch
+    if check_suite.before == "0000000000000000000000000000000000000000":
+        check_run.update(title="First commit", conclusion=CheckRunConclusion.SUCCESS)
+        return
     if is_default_branch:
         commits = repository.compare(check_suite.before, check_suite.after).commits.reversed
     else: