Does multicast routing use the default gateway setting?

I have switch that routes udp multicast between vlans.

If I connect a device to VLAN on that switch with an IP address and Subnet Mask, but no default gateway... will the udp multicast sent by that devices be routed to the other VLAN?

I just tried this, and it being routed? Why, when there is no dg on the device sending the multicast?

Thanks