Merge pull request #118 from browserstack/AXE-789-distinguishable-link-enhc

Fix: AXE-789 - distinguishable-link standalone case

Author: Pooja0504

lib/checks/color/link-in-text-block-evaluate.js

@@ -136,6 +136,14 @@ function getColorContrast(node, parentBlock) {
   nodeColor = getForegroundColor(node);
   parentColor = getForegroundColor(parentBlock);
 
+  if (!nodeColor) {
+    nodeColor = new axe.commons.color.Color(0, 0, 0, 0);
+  }
+
+  if (!parentColor) {
+    parentColor = new axe.commons.color.Color(0, 0, 0, 0);
+  }
+
   if (!nodeColor || !parentColor) {
     return undefined;
   }