Only override fieldset_id with custom_fieldset_id if it’s present
Only override fieldset_id with custom_fieldset_id if it’s present

This is mostly to support prior versions. I have NFC why we did this in the first place. I’m sure I had a stellar reason, but couldn’t tell you what it is today.

Signed-off-by: snipe <e9c017fc53f27c86a4fb6d4f0de7d332b596a185@snipe.net>

ppavlov28/snipe-it,mtucker6784/snipe-it,snipe/snipe-it,mtucker6784/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,uberbrady/snipe-it,ppavlov28/snipe-it,snipe/snipe-it,ppavlov28/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,snipe/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,snipe/snipe-it,uberbrady/snipe-it