Do not show 0/0 in workshop table if workshop has no tasks

[cytadela8]

This fixes #659

This PR was vibecoded 🙃

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This change is 

[Copilot]

Pull Request Overview

This PR addresses issue #659 by avoiding the display of "0/0" in the workshop table when a workshop has no tasks. Key changes include:

• Adding logic to randomly determine and attach qualification tasks for qualifying workshops.
• Updating the workshop qualification fields and saving an associated qualification file.
• Modifying the workshop list template to conditionally show a dash ("-") instead of "0/0" when no qualification tasks exist.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
wwwapp/management/commands/populate_with_test_data.py	Added logic for qualification tasks file creation and threshold update.
templates/listworkshop.html	Updated template conditional to display "-" when tasks are missing.

Comments suppressed due to low confidence (2)

wwwapp/management/commands/populate_with_test_data.py:174

• [nitpick] Consider renaming the variable 'has_qualification_tasks' to something more descriptive (e.g., 'include_qualification_tasks') to clearly indicate that it determines whether qualification tasks should be attached to a qualifying workshop.

        is_qualifying = self.fake.boolean(chance_of_getting_true=70)

templates/listworkshop.html:81

• Consider adding test coverage to verify that the workshop table correctly displays '-' instead of '0/0' when no qualification tasks are attached.

                      <td data-order="-1">