Double pole fusing has pros and cons.
A fuse in the neutral can leave the appliance in an "unpowered but live" state after clearing a live to neutral fault which is not especially desirable. It's particually hazardous in situations where people working downstream of the protection point may regard working on wiring after performing single pole isolation as safe (UK electricians are certainly in the habbit of doing this, I suspect US ones are too).
On the other hand in a portable appliance placed on the worldwide market or even the european market you really don't know for sure which wire will be the neutral (think of a german or italian mains plug) or indeed if EITHER wire will be a neutral (think of a US 240V supply or a UK building site 110V supply).
I'm not sure about commercial equipment standards but I know that EN60601 (the medical electrical equipment standard) requires that live-neutral reversal be treated as "normal condition" which means if (part of) the purpose of the fusing is to protect against live-earth faults then double pole fusing would be needed.
Personally if it's going to be used on a portable enclosure to supply only equipment inside the enclosure I would just fit the two fuses and not worry about it. In other circumstances I might make a different judgement call and try to get it replaced with a model that only has single pole fusing.