Improve node registry test coverage

test/red/runtime/nodes/resources/local/TestNode4/TestNode4.html

@@ -0,0 +1,3 @@
+<script type="text/x-red" data-template-name="test-node-3"></script>
+<script type="text/x-red" data-help-name="test-node-3"></script>
+<script type="text/javascript">RED.nodes.registerType('test-node-3',{});</script>

test/red/runtime/nodes/resources/local/TestNode4/TestNode4.js

@@ -0,0 +1 @@
+throw new Error("fail to require");

test/red/runtime/nodes/resources/userDir/nodes/TestNode5/TestNode5.html

@@ -0,0 +1,5 @@
+<script type="text/x-red" data-template-name="test-node-5"></script>
+<script type="text/x-red" data-help-name="test-node-5"></script>
+<script type="text/javascript">RED.nodes.registerType('test-node-5',{});</script>
+<style></style>
+<p>this should be filtered out</p>

test/red/runtime/nodes/resources/userDir/nodes/TestNode5/TestNode5.js

@@ -0,0 +1 @@
+throw new Error("fail to require");