Update color-rgba use

Author: dy

src/lib/gl_format_color.js

@@ -25,7 +25,11 @@ function calculateColor(colorIn, opacityIn) {
 }
 
 function validateColor(colorIn) {
-    return isNumeric(colorIn) ? colorDfltRgba : (rgba(colorIn) || colorDfltRgba);
+    if (isNumeric(colorIn)) return colorDfltRgba;
+
+    var colorOut = rgba(colorIn);
+
+    return colorOut.length ? colorOut : colorDfltRgba;
 }
 
 function validateOpacity(opacityIn) {

src/lib/str2rgbarray.js

@@ -12,7 +12,8 @@
 var rgba = require('color-rgba');
 
 function str2RgbaArray(color) {
-    return rgba(color) || [0, 0, 0, 1];
+	var colorOut = rgba(color);
+    return colorOut.length ? colorOut : [0, 0, 0, 1];
 }
 
 module.exports = str2RgbaArray;