Don't close novelWriter after the backup fails

[HeyMyian]

There is a slight UX problem when a backup is supposed to run at project close but no valid backup path is set. novelWriter throws an error message informing me about the unsuccessful backup because no valid backup path but then closes anyway. I have to reopen novelWriter/the project to set the backup path and close again.

It would be better if novelWriter abandons the exit procedure and keeps itself open [and potentially opens the settings page on the correct tab for me to correct the backup path]. As I already expressed my wish to create a backup, it's unlikely that I will be okay with novelWriter quitting before the backup was actually successful.

These are my settings:

• Run backup when the project is closed: on
• Ask before running backup: on
• Backup storage location: none (e.g. network location is not available or folder was renamed/removed [for some reason this just keeps happening with me])