Merge pull request #374 from Handig-Eekhoorn/PR-ignore_null-byte_for_nth-child_selectors

BUGFIX for null-byte at nth-child selectors

Author: ylafon

org/w3c/css/values/CssANPlusB.java

@@ -206,7 +206,9 @@ public String toString() {
                 sb.append('n');
             }
             if (b != null) {
-                sb.append(operator);
+            	if(operator != '\0') {
+            		sb.append(operator);
+            	}
                 sb.append(b.toPlainString());
             }
             representation = sb.toString();