Handle empty module titles on saving the course from the tour

[merkushin]

Resolves #7625

The problem described in the issue happens when, while following the tour, the user doesn't set the module title.

The course structure can't be saved in this case, and it causes the issue that the expected “Edit Lesson” link doesn't appear in the toolbar.

Proposed Changes

• Set default names for modules without titles when we initiate saving the course from the tour.
• Adjust the text in the tour to instruct the user to set a title for the module.

Testing Instructions

1. On a new website, create a course, and follow the next steps before saving/publishing the course.
2. Take the tour and on the third step (“Adding a module”) make sure we mention the need to add the title for the module: “Then click the Module option and give it a name.”
3. Add a few modules without setting titles for them.
4. Follow the tour to the end.
5. Make sure each module without a name got a title like “Module N” where N is an ordinal number towards the end of the tour.
6. Make sure you see "Edit Lesson" in the toolbar for lessons when the tour says we should see it there.

CleanShot.2024-07-31.at.20.22.48.mp4

Pre-Merge Checklist

• PR title and description contain sufficient detail and accurately describe the changes
• Acceptance criteria is met
• Decisions are publicly documented
• Adheres to coding standards (PHP, JavaScript, CSS, HTML)
• All strings are translatable (without concatenation, handles plurals)
• Follows our naming conventions (P6rkRX-4oA-p2)
• Hooks (p6rkRX-1uS-p2) and functions are documented
• New UIs are responsive and use a mobile-first approach
• New UIs match the designs
• Different user privileges (admin, teacher, subscriber) are tested as appropriate
• Legacy courses (course without blocks) are tested
• Code is tested on the minimum supported PHP and WordPress versions
• User interface changes have been tested on the latest versions of Chrome, Firefox and Safari
• "Needs Documentation" label is added if this change requires updates to documentation
• Known issues are created as new GitHub issues

[github-actions]

Test the previous changes of this PR with WordPress Playground.

[github-actions]

WordPress Dependencies Report

The github-action-wordpress-dependencies-report action has detected some script changes between the commit fa1d39b and trunk. Please review and confirm the following are correct before merging.

Script Handle	Added Dependencies	Removed Dependencies	Total Size	Size Diff
admin/tour/course-tour/index.js			37 kB	+1.18 kB ( +3.31% 🔼 )

This comment was automatically generated by the github-action-wordpress-dependencies-report action.

[github-actions]

Test the previous changes of this PR with WordPress Playground.

[Imran92]

Looks good, can we add a test similar to these? https://github.com/Automattic/sensei/blob/trunk/assets/admin/tour/helper.test.js

[github-actions]

Test the previous changes of this PR with WordPress Playground.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 51.91%. Comparing base (841c158) to head (fa1d39b).
Report is 118 commits behind head on trunk.

Files	Patch %	Lines
assets/admin/tour/course-tour/steps.js	0.00%	16 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk    #7652      +/-   ##
============================================
+ Coverage     51.84%   51.91%   +0.06%     
- Complexity    11436    11456      +20     
============================================
  Files           652      652              
  Lines         48656    48721      +65     
  Branches        470      475       +5     
============================================
+ Hits          25228    25292      +64     
+ Misses        23047    23045       -2     
- Partials        381      384       +3     

Files	Coverage Δ
assets/admin/tour/course-tour/steps.js	1.41% <0.00%> (-0.24%)	⬇️

... and 11 files with indirect coverage changes

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[merkushin]

Thanks for testing @Imran92.

Unfortunately, the steps module doesn't have any existing tests.
The function I added makes sense only in the context of the module, so I don't even export it.
In current circumstances, I prioritize other work. I'll go ahead and merge the PR.

What do you think about adding a card for covering the whole steps module with tests, and address it next time we'll have time for that?

Update: I created an issue: #7656