Handle exception when GitHub can't find a commit

.github/images.yml

@@ -1,6 +1,6 @@
 images:
   - path: ./images/gh-gl-sync
-    image: ghcr.io/spack/ci-bridge:0.0.46
+    image: ghcr.io/spack/ci-bridge:0.0.47
 
   - path: ./images/ci-key-clear
     image: ghcr.io/spack/ci-key-clear:0.0.3

images/gh-gl-sync/SpackCIBridge.py

@@ -6,6 +6,7 @@
 from datetime import datetime, timedelta, timezone
 import dateutil.parser
 from github import Github
+from github.GithubException import GithubException
 import json
 import os
 import re
@@ -138,7 +139,11 @@ def get_commit(self, commit):
         """ Check our cache for a commit on GitHub.
             If we don't have it yet, use the GitHub API to retrieve it."""
         if commit not in self.cached_commits:
-            self.cached_commits[commit] = self.py_gh_repo.get_commit(sha=commit)
+            try:
+                self.cached_commits[commit] = self.py_gh_repo.get_commit(sha=commit)
+            except GithubException as ghe:
+                print(ghe)
+                return None
         return self.cached_commits[commit]
 
     def list_github_prs(self):
@@ -605,6 +610,9 @@ def post_pipeline_status(self, open_prs, protected_branches):
     def create_status_for_commit(self, sha, branch, state, target_url, description):
         context = os.environ.get("GITHUB_STATUS_CONTEXT", "ci/gitlab-ci")
         commit = self.get_commit(sha)
+        if commit is None:
+            print(f"Unable to find GitHub commit for sha {sha} on branch {branch}")
+            return
         existing_statuses = commit.get_combined_status()
         for status in existing_statuses.statuses:
             if (status.context == context and

k8s/production/custom/gh-gl-sync/cron-jobs.yaml

@@ -16,7 +16,7 @@ spec:
           restartPolicy: Never
           containers:
           - name: sync
-            image: ghcr.io/spack/ci-bridge:0.0.46
+            image: ghcr.io/spack/ci-bridge:0.0.47
             imagePullPolicy: IfNotPresent
             resources:
               requests:
@@ -69,7 +69,7 @@ spec:
           restartPolicy: Never
           containers:
           - name: sync
-            image: ghcr.io/spack/ci-bridge:0.0.46
+            image: ghcr.io/spack/ci-bridge:0.0.47
             imagePullPolicy: IfNotPresent
             resources:
               requests:

k8s/production/custom/kokkos-sync/cron-jobs.yaml

@@ -16,7 +16,7 @@ spec:
           restartPolicy: Never
           containers:
           - name: sync
-            image: ghcr.io/spack/ci-bridge:0.0.46
+            image: ghcr.io/spack/ci-bridge:0.0.47
             imagePullPolicy: IfNotPresent
             resources:
               requests: