[std] Abnormal termination if archive extraction fails

[OPNA2608]

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