Preferences: GM crash on startup if any "Paths" field was left blank and saved in the last IDE session should block allowing a blank path

[gm-bug-reporter]

Description

Crash on opening IDE if empty field was left in the settings
If a blank field is left in the path settings, the IDE will no longer open, but will crash on startup.
I guess if the field was left blank, there should either be a dialog box telling you to make changes, or the default option should be set.

Steps To Reproduce

Make changes to the Paths settings, leaving a blank field. Save, exit GM, try to start it again. After loading the IDE, it crashes immediately.

Which version of GameMaker are you reporting this issue for?

IDE v2024.400.0.532 Runtime v2024.400.0.551

Which operating system(s) are you seeing the problem on?

Windows 10.0.22631.0

237559cd-c202-44d8-a5be-cb9b2b98a696

[stuckie]

This fix will now ensure you cannot put a blank path in, and it'll revert it back.
It'll also detect a similar thing in the preferences on start-up, and reset to the default if need be.
This should ensure that the IDE cannot get into a state where it cannot start up due to a blank/corrupted path.

[mgeddesGM]

verified as of IDE v2024.400.0.542 Runtime v2024.400.0.561