[4.0] Fix edge case PHP Notice in com_finder

[wilsonge]

Summary of Changes

Fixes an edge case in com_finder which gave a PHP Notice

Testing Instructions

Create a category in Joomla such as "Article 0 of 1" and save it. Then check your PHP error log (note due to the redirect to the list view you won't see this in the UI) and you'll find a PHP Notice. Apply patch. After patch the notice is gone.

Alternatively you can code review array_filter PHP documentation which tells you array keys are preserved. Which is bad for our for loop later on line 131 here 4.0-dev...wilsonge:patch-finder#diff-6f122d9d8749e848d0ea1343cf256cd1L131.

Documentation Changes Required

None

[SharkyKZ]

I have tested this item ✅ successfully on 43ae611

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[Hackwar]

I have tested this item ✅ successfully on 43ae611

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/27797.}

[alikon]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/27797.}

[wilsonge]

Thanks guys!