[5.4] Remove unnecessary $this->setError('')

[Hackwar]

Summary of Changes

Turns out that somehow we have very old code that by default sets an (empty) error each time we save something or publish a nested entity. This triggers the new code for useException. This removes these unnecessary commands.

Testing Instructions

codereview...

Actual result BEFORE applying this Pull Request

Everything works.

Expected result AFTER applying this Pull Request

Everything works like before.

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

[alikon]

I have tested this item ✅ successfully on 2b63c74

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