[6.0] Improved removal of unnecessary fields and empty fieldsets

[TLWebdesign]

Pull Request for Issue # .

Summary of Changes

• Added back "Show On" attribute which works out of the box.
• Improved the way unnecessary fields are removed
• Added code to remove empty smartsearch fieldset
• Added default value for close parameter

Thanks to @bembelimen for helping me with this!

Testing Instructions

• Check that there are no empty fieldsets
• Check that the show_on attribute is working
• Check for other unnecessary fields that have not been removed yet.
• Check that the close button has a default value of true.

Actual result BEFORE applying this Pull Request

Showing empty fieldsets

Expected result AFTER applying this Pull Request

No empty fieldsets present

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

[tecpromotion]

I have tested this item ✅ successfully on 5b6ea82

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