CanvasRenderer: Handle data textures.

examples/js/renderers/CanvasRenderer.js

@@ -827,6 +827,15 @@ THREE.CanvasRenderer = function ( parameters ) {
 
 		var image = texture.image;
 
+		if ( image.complete === false ) {
+
+			return {
+				canvas: undefined,
+				version: 0
+			}
+
+		}
+
 		var canvas = document.createElement( 'canvas' );
 		canvas.width = image.width;
 		canvas.height = image.height;