Error in bash completion

[Harrison McCullough <mccullough.harrison@gmail.com>]

What did you do before the bug happened? (Steps to reproduce your issue)

1. Create a Bash function, e.g. `ga() { git add "${@:-.}"; }`
2. Use the `__git_complete` function to add Bash tab completion for your custom
   Bash function, e.g. `__git_complete ga git_add`
3. Attempt to tab complete a file path, e.g. `ga my-incomplete-file-path<TAB>`


What did you expect to happen? (Expected behavior)

Bash tab-completes the file path.


What happened instead? (Actual behavior)

Bash tab-completes the file path but also displays an error:

$ ga fi-bash: [: -lt: unary operator expected
le3.txt

(This is when I was using tab completion to add a file called `file3.txt`).


What's different between what you expected and what actually happened?

I do not expect using tab completion to display an error.


Anything else you want to add:

I have tested this with a minial setup with Bash version 5.1.8(1)-release with
no other files sourced at startup except
/usr/local/Cellar/git/2.32.0/etc/bash_completion.d/git-completion.bash

[System Info]
git version:
git version 2.32.0
cpu: x86_64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
uname: Darwin 20.5.0 Darwin Kernel Version 20.5.0: Sat May  8 05:10:33
PDT 2021; root:xnu-7195.121.3~9/RELEASE_X86_64 x86_64
compiler info: clang: 12.0.5 (clang-1205.0.22.9)
libc info: no libc information available
$SHELL (typically, interactive shell): /usr/local/bin/bash


[Enabled Hooks]

-Harrison McCullough