[5.3] GET content/articles render the placeholder only

[alikon]

Pull Request for Issue #45355 .

Summary of Changes

render the placeholder only

Testing Instructions

create a custom HTML module
create an article and embed it with something like {loadmoduleid 111}
do a GET via postman /api/index.php/v1/content/articles

Actual result BEFORE applying this Pull Request

error code 500

Expected result AFTER applying this Pull Request

no more error code

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

[QuyTon]

No error code 500 for me.

Before PR:
"text": "<p>Wrapper Component</p>\r\n<p></p>\r\n<p></p>\r\n<p></p> "

After PR;
"text": "<p>Wrapper Component</p>\r\n<p>{loadmodule mod_login Login 2}</p>\r\n<p>{loadmoduleid 134}</p>\r\n<p>{loadposition test}</p> "

Is this the expected result?