Blueprint - Better Error Notification

[sturple]

Currently right now if there is an error in a blueprint, for example a theme/blueprints/default.yaml, the only way you know there is an error is because your overrides in the blueprint don't show up. There is no indication of where the error is.
I know symfony does use ParseException error, which usually gives a line number and a near item message.
Knowing part of the issue might be that this goes all the way back to https://github.com/rockettheme/toolbox/tree/develop/File/src.

If there is a solution to this either in the form of the debugger or throwing an exception this would be appreciated.

I also noticed while trying to figure this out, that all the downloaded theme blueprints get parsed.

Regards,
Shawn