MMCQ.quantize(...) can return false or undefined thus breaking the application.

[mhahmadi]

cmap can become false or undefined after the following statement causing cmap.palette() in the next line to throw an error.

var cmap = MMCQ.quantize(pixelArray, colorCount);

it can be prevented with the following check and perhaps the return value can be null in such situation:

var cmap = MMCQ.quantize(pixelArray, colorCount);
var palette = cmap? cmap.palette() : null;

[lokesh]

#55 merged. Thanks again.