[FIX] Skeleton nodes with one keyframe now work properly with addTime function.
[FIX] Skeleton nodes with one keyframe now work properly with addTime function.

MicroWorldwide/PlayCanvas,horryq/engine-1,RainsSoft/engine,shinate/engine,RainsSoft/engine,maxwellalive/engine,nizihabi/engine,H1Gdev/engine,shinate/engine,3DGEOM/engine,sanyaade-teachings/engine,SuperStarPL/engine,3DGEOM/engine,sereepap2029/playcanvas,maxwellalive/engine,guycalledfrank/engine,H1Gdev/engine,playcanvas/engine,MicroWorldwide/PlayCanvas,horryq/engine-1,RainsSoft/engine,sereepap2029/playcanvas,shinate/engine,SuperStarPL/engine,horryq/engine-1,sanyaade-teachings/engine,nizihabi/engine,SuperStarPL/engine,nizihabi/engine,maxwellalive/engine,sanyaade-teachings/engine,sereepap2029/playcanvas,aidinabedi/playcanvas-engine,guycalledfrank/engine,3DGEOM/engine,playcanvas/engine,aidinabedi/playcanvas-engine