Commits on Feb 19, 2021

1. fix: unbound variables in bash completion …

   when `set -o nounset` in Bash,
   the warnings of unbound variables will break the bash completion.
   
   use `kubectl` as example:
   
   ```sh
   $ set -o nounset
   $ my-cli <Tab>-bash: BASH_COMP_DEBUG_FILE: unbound variable
   $
   ```
   
   the warning break bash completion without any completion result,
   and cause my cursor move to the newline.
   
   Use `${variable:-}` substitution in Bash,
   that assign an empty string as default for unbound variables to fix the warnings.

   

   edentsai committed Feb 19, 2021
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