[Chapel Merge] Fix a null dereference in a dyno stringify functio

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Branch: refs/heads/main
Revision: 6b8e977
Author: mppf
Link: Unavailable
Log Message:

Merge pull request #20702 from mppf/fix-tracing-coredump

Fix a null dereference in a dyno stringify function

Fixes a minor problem in a stringify function to fix a core dump I
noticed when doing some tracing.

Reviewed by @riftEmber - thanks!