Open IDF fails with a cryptic error if an IDF is opened in a sector without user permissions

[Huite]

The GDAL driver fails silently in creating a tif when the user has no permission.

The resulting error is that None type has no attribute setGeoTransform:

imod-qgis/imodqgis/idf/conversion.py

Line 40 in 1480578

self.__raster__.SetGeoTransform((xmin, dx, 0.0, ymax, 0.0, dy))

This is a typical problem since GDAL does not return error codes or anything. We should check whether the TIF has been succesfully made, and if not, raise a QGIS error.
This error should clearly state that the TIF could not be made, and that permissions are required as a hint.