Verify elements are non-null before adding event listener #2587
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When loading www.freecen.org.uk, I see a few console errors.
Two of these are
Uncaught TypeError: Cannot read properties of null (reading 'addEventListener').This change checks the elements having click listeners attached are truthy before reading their
addEventListener(orattachEvent) attributes. It also future-proofs the subsequent check for element#trigger-offcanvas-old.