Fixed wholeWordTrim() and snippetString() fail if the value of $string is 0

There are a few other places where this arises in 2.2.9. Someone should probably go through all of the changes in 2.2.9 and change any tests on strings to use ?? or === instead.
Thank you for reporting this issue, it has now been resolved. We are aiming to include any changes that have been made in a future XF release (2.2.11).

Change log:
Properly account for falsy values in wholeWordTrim and snippetString functions
There may be a delay before changes are rolled out to the XenForo Community.
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