[FW][FIX] web: more reliably avoid downloads on new file #77695
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5195550 mitigated an issue of being
able to try and download files which don't exist yet, make the fix
more reliable by clearing out the field completely before only
re-inserting content.
Also clean up the code:
(a8d01cb) which seems less correct
as it applies conditionally
judiciously leveraging jquery's API
Forward-Port-Of: #77603