Fix bad type check that caused rows to not refresh
Fix bad type check that caused rows to not refresh

Tyriar/xterm.js,Tyriar/xterm.js,akalipetis/xterm.js,Tyriar/xterm.js,xtermjs/xterm.js,sourcelair/xterm.js,sourcelair/xterm.js,sourcelair/xterm.js,xtermjs/xterm.js,Tyriar/xterm.js,xtermjs/xterm.js,akalipetis/xterm.js,akalipetis/xterm.js,Tyriar/xterm.js,xtermjs/xterm.js,akalipetis/xterm.js,sourcelair/xterm.js,xtermjs/xterm.js