RNGLR Recognizer now works for grammers without null rules.

src/ParseRule.cpp

@@ -73,6 +73,10 @@ int ParseRule::getIndex() {
 	return pointerIndex;
 }
 
+std::vector<NodeTree<Symbol*>*>* ParseRule::nullReductions() {
+	//Return a vector of null reduction trees
+}
+
 bool ParseRule::advancePointer() {
 	if (pointerIndex < rightSide.size()) {
 		pointerIndex++;