Description of Defects in migrationScript2 and migrationScript4:

Several additional issues have been identified in the Assembly
functions migrationScript4 and migrationScript2, beyond those fixed in
patch 71f0104.

One common problem is that the Joint property Reference1 or Reference2
can be set to an invalid format. For example, user can manually cause
this issue by assigning an incorrect reference (e.g., the Z-axis) to
these properties via the FreeCAD GUI.  When this happens, internal
errors (exceptions and their corresponding Python call stack) are
reported in the Report View.  However, such information is not helpful
for the user to fix their 3D model.

Issues with the Current Implementation (Using migrationScript4 as
Reference):

- Lack of Type Validation for Reference1 and Reference2:

  The script does not check whether joint.Reference1[1] or
  joint.Reference2[1] is a sequence. If this condition is not met,
  statements like:

    sub1 = joint.Reference1[1][0]

  will throw an exception, printing the Python call stack.

- Lack of Length Validation for Sequences:

  The script does not ensure that the sequence length is sufficient
  for indexing. For example, joint.Reference1 and joint.Reference2
  must each have at least two elements to allow:

    joint.Reference1[1][1]
    joint.Reference2[1][1]

  Without validation, such calls can result in exceptions, printing the
  Python call stack.

- No Feedback on Problematic Joint:

  The user is not informed about which Assembly joint in the object
  hierarchy has an invalid Reference1 or Reference2. Depending on the
  size of the 3D model, identifying the defect can be time-consuming
  and frustrating without proper feedback.

This patch is focused on:

- Reporting Problematic Joint Path:

  A new function has been added to retrieve the full path to the
  Assembly joint. The return value (a string) is used to report the
  issue.

- Improved Exception Handling:

  Instead of adding more conditional checks (see above), exception
  handling is implemented. AttributeError, IndexError, and TypeError
  exceptions are caught. The exception message (excluding the call
  stack) is displayed at the end of a user-friendly warning.

- User-Friendly Warnings in the Report View:

  A single-line warning is now shown in the Report View, containing
  the following details:

    - Source of Warning:              'Assembly joint'
    - Location in the 3D Model: e.g., 'Assembly_XY.object_XY.joint_XY'
    - Problematic Attribute: e.g.,    'ReferenceXY'
    - Exception Message: e.g.,        'list index out of range'

- Refactoring and Optimization:

  The functions were refactored and optimized at the end of the
  conversion process.

Advantages:

- Cleaner Report View:
  Internal errors (e.g., Python call stacks) are no longer logged in
  the Report View, as they are not useful for end users. Only the
  exception message is displayed.

- Improved User Feedback:
  Users can now identify the problematic Assembly joint in the object
  hierarchy, saving significant time and effort.

- Robust and Concise Code:
  The solution simplifies the code while increasing its robustness.