fix(rgbToHex): transparent is not a valid rgb color ie issue

Author: xidedix

js/src/utilities/rgb-to-hex.js

@@ -10,6 +10,9 @@ const rgbToHex = (color) => {
   if (typeof color === 'undefined') {
     throw new Error('Hex color is not defined')
   }
+  if (color === 'transparent') {
+    return '#00000000'
+  }
   const rgb = color.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i)
   if (!rgb) {
     throw new Error(`${color} is not a valid rgb color`)