Print something when WebGLRenderingContext fails

[remorses]

gl currently silently returns null if WebGLRenderingContext fails (i assume because of missing dynamic libraries or undefined symbols)

Why not print the error in the console? debugging is very difficult this way

headless-gl/src/javascript/node-index.js

Lines 38 to 53 in f1ed92f

	try {
	ctx = new WebGLRenderingContext(
	1,
	1,
	contextAttributes.alpha,
	contextAttributes.depth,
	contextAttributes.stencil,
	contextAttributes.antialias,
	contextAttributes.premultipliedAlpha,
	contextAttributes.preserveDrawingBuffer,
	contextAttributes.preferLowPowerToHighPerformance,
	contextAttributes.failIfMajorPerformanceCaveat)
	} catch (e) {}
	if (!ctx) {
	return null
	}