check if values array exists
check if values array exists

before checking if a color needs to be added to a color, gulp checks if any value exists at all.

fix #63
Signed-off-by: Armin Hueneburg <ce14971603cce67272d611a4f194786e96eb4828@gmail.com>

ultimate-comparisons/ultimate-comparison-BASE,ultimate-comparisons/ultimate-comparison-BASE,ultimate-comparisons/ultimate-comparison-BASE,ultimate-comparisons/ultimate-comparison-BASE,ultimate-comparisons/ultimate-comparison-BASE