[v1] (backport) Prevent panic on flagSet access from custom BashComplete #1101
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What type of PR is this?
What this PR does / why we need it:
See: #946. I've basically copied the code from v2 to v1 and extended the tests a little bit. All credits to the author of the fix @unRob
Which issue(s) this PR fixes:
Fixes: #1093
Special notes for your reviewer:
For more context see: #946
Release Notes