BUG: GUI silently crashes if `classes.txt` is not found

HumanSignal / labelImg

LabelImg is now part of the Label Studio community. The popular image annotation tool created by Tzutalin is no longer actively being developed, but you can check out Label Studio, the open source data labeling tool for images, text, hypertext, audio, video and time-series data.

MIT License

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When a folder is opened in labelImg GUI that doesn't have classes.txt, the GUI silently crashes without showing any error popup.

Steps to Reproduce

Put some images and corresponding annotation text files in a test folder.
DON'T create classes.txt.
Start labelImg GUI, and open the test folder using Open Directory.
labelImg tries to read classes.txt in the test folder, and prints FileNotFound error to the console.
No error popup is shown in the GUI and the program crashes after a few moments.

Environment

OS: Windows 11
PyQt version: 5.5.19
Python version: 3.11

HumanSignal / labelImg

BUG: GUI silently crashes if `classes.txt` is not found #979

Steps to Reproduce

Environment