print a console error if a char is missing in the font (#2984)
print a console error if a char is missing in the font (#2984)

Co-authored-by: Iakov Sumygin <d75abb0dd9a7d0c943ed7d6bf530aa3e321dc2df@snap.com>
MicroWorldwide/PlayCanvas,MicroWorldwide/PlayCanvas,playcanvas/engine,playcanvas/engine