[4.0] Fix Legacy Model loading. Fixes #23517

[wilsonge]

See #23517 for test instructions. Note you must test with an extension that hasn't been namespaced and uses core MVC

[PhocaCz]

I have tested this item ✅ successfully on efbeebb

Tested on Joomla! 4.0.0-alpha7-dev

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[ChristineWk]

I have tested this item ✅ successfully on efbeebb

Tested on alpha-7 with new installation of extension Phocadownload.
But: I did'nt get the failure as shown in #23525. Phocadownload > Files, I got:
An error has occurred.

0 Call to a member function get() on null 

After using the Patch, above message has gone.

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[Quy]

RTC

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[ChristineWk]

Checked again, because first test was only with "Files" but now, all: (present status):
Files / Categories / Licenses / Downloads / Uploads / File Rating / Styles
0 Call to a member function get() on null

Layout
Call to a member function getTable() on boolean and:
Warning: Invalid argument supplied for foreach() in /.../administrator/components/com_phocadownload/views/phocadownloadstat/view.html.php on line 28 Warning: count(): Parameter must be an array or an object that implements Countable in .../administrator/components/com_phocadownload/views/phocadownloadstat/view.html.php on line 36

after Patch; both messages has gone

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[wilsonge]

Thanks guys :)