Import VM path still required after unchecking

[digitalec]

When creating a new VM, if you check the box for "Import VM files from:" and then uncheck it again it still produces the error: "If you wish to import VM files, you must specify a path."

[daviunic]

Confirmed in 1.5.3, will be fixed.

[daviunic]

Fixed in 1.5.4. I was always setting a bool to true on checked_changed event instead of negating it...