That seems to be some input decoupling / noise supression. Seems to be located on some power input rail.
If it works now without it, I'd be quite confident it will continue working.
Decoupling/filtering caps may be usually omitted/optimized out of designs as at times they may even be redundant or used too extensively - but you never know, this is a very complex topic to discuss here.
Leave it without the cap, you can continue using it. I would not be that much worried.