In com_tags, a tagged element's text-variable is transformed into nul…

[svenbluege]

Deprecation messages are shown for some tagged elements:

Summary of Changes

In com_tags, a tagged element's text-variable is transformed into null if the value is empty.
That causes deprecation messages in plugins like loadmodules and emailcloak. They usually don't need to check for null values in $article->text.

Testing Instructions

1. configure PHP to show deprecation messages
2. create a new contact using com_contact: just enter a name and tag it with "testtag"
3. open the frontend /index.php?option=com_tags&view=tags
4. click on the new tag 'testtag'.
5. see the deprecation messages.

Actual result BEFORE applying this Pull Request

Following the test instructions, deprecation messages are shown

Expected result AFTER applying this Pull Request

Following the test instructions, deprecation messages are now shown

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[svenbluege]

This issue was fixed with the same code in 4.2.7, I'm missing the change in 4.3. Here is my try to add it to 4.3 again.
Original PR which was included in 4.2.7: #39640

[Quy]

I have tested this item ✅ successfully on 548adf2

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/40048.}

[Quy]

@obuisard This was missed in the upmerge. Should be ok to merge without an additional test.

[obuisard]

Thank you Sven @svenbluege for the PR!