Update Standards/WCAG2AAA/Sniffs/Principle1/Guideline1_3/1_3_5.js

Co-Authored-By: Anthony Barnes <abarnes@squiz.com.au>

Author: stefanruijsenaars

Standards/WCAG2AAA/Sniffs/Principle1/Guideline1_3/1_3_5.js

@@ -96,6 +96,9 @@ _global.HTMLCS_WCAG2AAA_Sniffs_Principle1_Guideline1_3_1_3_5 = {
         ];
 
         var valuesStr = element.getAttribute("autocomplete");
+        if (typeof valuesStr !== 'string') { 
+            return;
+        }
         var values = valuesStr.split(" ");
 
         var hasFaultyValue = false;