Describe the bug
Failing to extract an archive's contents (maybe even if the archive is empty?) causes std to show an error dialogue (see screenshot), then close with return value 1.

To Reproduce

1. touch invalid.rar
2. std
3. -> Open SPC, select invalid.rar
4. Press OK on error message

Expected behavior
Catching a failed extraction / extraction without any files

Screenshots

Desktop (please complete the following information):

• OS: Linux [NixOS 20.09 (Nightingale) x86_64]
• Version v0.2.0