The .jobstatus command could crash the director. This PR fixes that crash and adds a test for it.

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Checklist for the reviewer of the PR (will be processed by the Bareos team)

General

• PR name is meaningful
• Purpose of the PR is understood
• Commit descriptions are understandable and well formatted
• Check backport line
• Is the PR title usable as CHANGELOG entry?
• Separate commit for CHANGELOG.md ("update CHANGELOG.md"). The PR number is correct.

Source code quality

• Source code changes are understandable
• Variable and function names are meaningful
• Code comments are correct (logically and spelling)
• Required documentation changes are present and part of the PR
• bareos-check-sources --since-merge does not report any problems

Tests

• Decision taken that a test is required (if not, then remove this paragraph)
• The choice of the type of test (unit test or systemtest) is reasonable
• Testname matches exactly what is being tested
• On a fail, output of the test leads quickly to the origin of the fault