wxGUI: Fix E722 do not use bare 'except' warnings in gui_core/

[arohanajit]

Description:

This PR addresses the E722 do not use bare 'except' warnings by specifying the exception types to be caught in the following files in gui_core/ directory:

1. dialogs.py:

   • Change: Specified re.error for regular expression operations.

2. forms.py:

   • Change: Specified Exception as a general catch-all.
   • Rationale: Using a general exception handler as there could be multiple applicable exceptions (two I could see were IndexError,AttributeError)

3. ghelp.py:

   • Change: Specified KeyError for dictionary operations, a general catchall Exception for everything else

4. gselect.py:

   • Change: Specified Exception as a general catch-all.
   • Rationale: Using a general exception handler as there could be multiple applicable exceptions (potential errors from wx module)

5. widgets.py:

   • Change: Specified ValueError for datetime parsing.

Rationale:

• Specific Exception Handling: Improves code clarity and robustness by handling only relevant exceptions.
• Code Quality: Adheres to PEP 8 guidelines, ensuring better maintainability and readability.

Please review the changes and let me know if any further modifications are needed.

[echoix]

Do you happen to know if there's an extra flake8 exclusion removed here?

[echoix]

Oh, I see that another wxGUI PR that I enabled automerge on would touch that line, so it's sure a conflict will happen. So probably this and some other PRs will need to have their conflicts fixed once that other PR is merged. But that other PR is queued after this and other ones.

[arohanajit]

Sure, I will go through the PRs and fix the merge conflicts when and where they happen

[echoix]

Conflicts to solve.