Fix module rendering on error page

[SharkyKZ]

Fixes regression from #10847.

Summary of Changes

Fixes notices and rendering of modules on error page.

Testing Instructions

Publish a module in position-0 position.
Cause an error page to be rendered.

Actual result BEFORE applying this Pull Request

Module not rendererd and notices are shown:

Notice: Array to string conversion in C:\wamp\www\joomla-cms-3\templates\protostar\error.php on line 123

Expected result AFTER applying this Pull Request

Module rendered and no notices.

Documentation Changes Required

No.

[ghost]

I have tested this item ✅ successfully on e6be732

Error page rendered by modification the index.php.

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[viocassel]

I have tested this item ✅ successfully on e6be732

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/30578.}

[Quy]

RTC

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[HLeithner]

Thanks