fix: avoid panic when sourcemap doc does not contain hit #4619
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Motivation/summary
Apparently it can happen that the returned ES doc indicates a sourcemap was fetched but the actual
hit
does not contain one. This is unexpected and should not happen, therefore it would be interesting how to reproduce and figure out if there is another underlying issue.Nevertheless, APM Server should not panic, so let's get this PR in to fix it.
Checklist
- [ ] Documentation has been updatedHow to test these changes
Let's wait if we can get more input from the user reporting the issue on how to reproduce.
Related issues
closes #4601