Error handling for gradient radial fill (missing 0 offset) in GFX

[guest]

If the following fill object is used for a rectangle fill:

var lg2 = {
		type: "radial",
		cx: 0, cy: 0, r: 50,
		colors: [
			{ offset: 0.2, color: "red" },
			{ offset: 0.8, color: "blue" }
			]
	};

IE 6 (SP2) stops at vml.js (line 93)

p.color = dojo.blendColors(q.color, p.color, q.offset / (q.offset - p.offset));

with an error: "'color' is null or not an object'. Index i is -1 at the time of the error.

Adding 0-offset to the gradient object fixes the problem:

var lg2 = {
		type: "radial",
		cx: 0, cy: 0, r: 50,
		colors: [
			{ offset: 0,   color: "red" },
			{ offset: 0.2, color: "red" },
			{ offset: 0.8, color: "blue" }
			]
	};

[Eugene Lazutkin]

(In [12673]) Fixing radial gradient problem when starting from offset > 0. Thx, Igor! Fixes #4604 !strict