Error displayed when clicking Cancel in the bounding box import dialog

[bauerdavid]

Describe the bug
Error displayed when clicking Cancel in the bounding box import dialog.

To Reproduce
Steps to reproduce the behavior:

1. Open Object list widget
2. Click on 'Import'
3. Click 'Cancel'
4. See error

Expected behavior
Nothing should happen (besides closing the dialog)

napari info
napari: 0.4.15
Platform: Windows-10-10.0.22621-SP0
Python: 3.9.10 (tags/v3.9.10:f2f3f53, Jan 17 2022, 15:14:21) [MSC v.1929 64 bit (AMD64)]
Qt: 5.15.2
PyQt5: 5.15.6
NumPy: 1.22.4
SciPy: 1.8.1
Dask: 2022.05.2
VisPy: 0.9.6

OpenGL:

• GL version: 4.5.0 - Build 25.20.100.6577
• MAX_TEXTURE_SIZE: 16384

Screens:

• screen 1: resolution 1920x1080, scale 1.0
• screen 2: resolution 1920x1080, scale 1.0

Plugins:

• console: 0.0.4
• napari-nd-cropper: 0.1.3
• napari-tools-menu: 0.1.11
• scikit-image: 0.4.15
• svg: 0.1.6

[bauerdavid]

fixed by 864b2af