Fix error handling in image processing and show correct Error#191
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The GUI was showing unclear error message like "
Failed to process image: None" when image processing failed as it was not detecting if some libraries were missing.This change moves the backgroundremover import into the existing processing try block so import errors can be caught and displayed by the GUI error modal. It also falls back to the exception type as before when the error message is empty.
This helps users see useful errors, such as missing dependencies, instead of a blank or None message.