DS Crashes when importing .qtbridge with variables

When importing a .qtbridge file with "Export Variables" checked on (figma project also contains variables) the importer causes DS to crash after a few seconds.

Understood we only support local variables at this time, but we should push a warning message in either Figma or DS as to why the application crashes. 

Product: Qt Design Studio 4.6 (4.6.0)
Based on: Qt 6.7.3 (Clang 15.0 (Apple), arm64)
Built on: Sep 17 2024 07:47:55
From revision: 478192cdfd