Make error in addSlot a warning and return null
Make error in addSlot a warning and return null

MicroWorldwide/PlayCanvas,MicroWorldwide/PlayCanvas,playcanvas/engine,H1Gdev/engine,aidinabedi/playcanvas-engine,guycalledfrank/engine,guycalledfrank/engine,H1Gdev/engine,sereepap2029/playcanvas,sereepap2029/playcanvas,sereepap2029/playcanvas,playcanvas/engine,aidinabedi/playcanvas-engine