[6.0][webservices] cannot delete not trashed resource return 409

[alikon]

Pull Request for Issue #45590 .

Summary of Changes

return HTTP status code 409 instead of 500
add a system test

Testing Instructions

delete not-trashed resource like: tag, category, article etc via webservices DELETE endpoint

Actual result BEFORE applying this Pull Request

HTTP status code 500 and error message "Internal server error".

Expected result AFTER applying this Pull Request

HTTP status code 409 with informative message like : Resource not in state that can be deleted, must be trashed before it can be deleted

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

[exlemor]

I have tested this item ✅ successfully on 9b475e6

I have tested this successfully via Postman! Thanks @alikon (and I confirmed that if you do Trash the article, if does DELETE it as well).

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[rbuelund]

I have tested this item ✅ successfully on 4fbb57e

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[exlemor]

I have tested this item ✅ successfully on 4fbb57e

I have re-tested this successfully ! Thanks @alikon

Same positive results :D

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