[Bug] Unable to extract folders in 7z archives

[TheRogueArchivist]

When trying to scan 7z archives, BOS is unable to extract folders and their contents. When attempting to, it gives the error:
Exception thrown: 'System.IO.DirectoryNotFoundException' in System.Private.CoreLib.dll

Also occurs with SFX archives using #321.

[mnadareski]

More information is needed. Please provide a full stacktrace as output by the debug build.

[TheRogueArchivist]

Fixed by 28ebc14.