[Fix] Don’t trigger an assert on initial blend weights getting set up (#4357)
[Fix] Don’t trigger an assert on initial blend weights getting set up (#4357)

Co-authored-by: Martin Valigursky <2113fa600d719248203230de1894fe2542067d96@snapchat.com>
MicroWorldwide/PlayCanvas,playcanvas/engine,MicroWorldwide/PlayCanvas,playcanvas/engine