`choose` crashes when in filter mode and you press `spacebar` twice

[MikaelFangel]

Describe the bug
When you use choose, press / to filter and then presses spacebar twice it crashed with an index out of bounds error.

To Reproduce
Steps to reproduce the behavior:

1. Run the command gum choose --no-limit x y z
2. Press / to enter filter
3. Press spacebar twice
4. See error

Expected behavior
Filter shouldn't crashes from multiple spaces when in filter.

Additional context
Error message produced:

Caught panic:

runtime error: index out of range [0] with length 0

Restoring terminal...

[MikaelFangel]

Typing x repeatedly can also crash the program.

[meowgorithm]

Just a note that this is now available in Gum v0.14.2.