check presence for cssobject isColorDark inquery

2015-10-01 14:44:58 +02:00
parent 52afec3146
commit 96e0daf31b
1 changed files with 1 additions and 1 deletions
@@ -19,7 +19,7 @@ App.CssObject.reopenClass
    [r, g, b]

  isColorDark: (rgb_hex)->
-    return false unless rbg_hex.match /#[0-9a-zA-Z]{6}/
+    return false unless rgb_hex and rbg_hex.match /#[0-9a-zA-Z]{6}/
    [r, g, b] = @rgb_to_numeric(rgb_hex)
    luma = 0.2126 * r + 0.7152 * g + 0.0722 * b # per ITU-R BT.709
    luma < 40