[llvm] [CI] Gracefully Fail when Job Completion Timestamp is None (PR #168457)

[Aiden Grossman via llvm-commits]

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@@ -370,6 +370,13 @@ def github_get_metrics(
             started_at = job.started_at
             completed_at = job.completed_at
 
+            if completed_at is None:
+                logging.info(
+                    "Workflow {} is marked completed but has a job without a "
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boomanaiden154 wrote:

Was meant to point to an ID through an fstring. Fixed now.

https://github.com/llvm/llvm-project/pull/168457