Ignore isFindBoundary

NoAttribute cannot be inherited...

pmd-core/src/main/java/net/sourceforge/pmd/lang/rule/xpath/impl/AttributeAxisIterator.java

@@ -39,7 +39,20 @@ public class AttributeAxisIterator implements Iterator<Attribute> {
                     Long.TYPE, Character.TYPE, Float.TYPE));
 
     private static final Set<String> FILTERED_OUT_NAMES
-        = new HashSet<>(Arrays.asList("toString", "getNumChildren", "getIndexInParent", "getParent", "getClass", "getRuleIndex", "getXPathNodeName", "altNumber", "toStringTree", "getTypeNameNode", "hashCode", "getImportedNameNode", "getScope"));
+        = new HashSet<>(Arrays.asList("toString",
+                                      "getNumChildren",
+                                      "getIndexInParent",
+                                      "getParent",
+                                      "getClass",
+                                      "isFindBoundary",
+                                      "getRuleIndex",
+                                      "getXPathNodeName",
+                                      "altNumber",
+                                      "toStringTree",
+                                      "getTypeNameNode",
+                                      "hashCode",
+                                      "getImportedNameNode",
+                                      "getScope"));
 
     /* Iteration variables */
     private final Iterator<MethodWrapper> iterator;