Add nice new report

openpype/hosts/maya/plugins/publish/help/validate_node_ids.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<root>
+<error id="main">
+<title>Missing node ids</title>
+<description>## Nodes found with missing `cbId`
+
+Nodes were detected in your scene which are missing required `cbId`
+attributes for identification further in the pipeline.
+
+### How to repair?
+
+The node ids are auto-generated on scene save, and thus the easiest fix is to
+save your scene again.
+
+After that restart publishing with Reload button.
+</description>
+<detail>
+### Invalid nodes
+
+{nodes}
+
+
+### How could this happen?
+
+This often happens if you've generated new nodes but haven't saved your scene
+after creating the new nodes.
+</detail>
+</error>
+</root>

openpype/hosts/maya/plugins/publish/validate_node_ids.py

@@ -1,6 +1,9 @@
 import pyblish.api
 
-from openpype.pipeline.publish import ValidatePipelineOrder
+from openpype.pipeline.publish import (
+    ValidatePipelineOrder,
+    PublishXmlValidationError
+)
 import openpype.hosts.maya.api.action
 from openpype.hosts.maya.api import lib
 
@@ -34,8 +37,14 @@ class ValidateNodeIDs(pyblish.api.InstancePlugin):
         # Ensure all nodes have a cbId
         invalid = self.get_invalid(instance)
         if invalid:
-            raise RuntimeError("Nodes found without "
-                               "IDs: {0}".format(invalid))
+            names = "\n".join(
+                "- {}".format(node) for node in invalid
+            )
+            raise PublishXmlValidationError(
+                plugin=self,
+                message="Nodes found without IDs: {}".format(invalid),
+                formatting_data={"nodes": names}
+            )
 
     @classmethod
     def get_invalid(cls, instance):