rename validate max contents to validate container & add related families to check the container contents

openpype/hosts/max/plugins/publish/validate_containers.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+import pyblish.api
+from openpype.pipeline import PublishValidationError
+
+
+class ValidateContainers(pyblish.api.InstancePlugin):
+    """Validates Containers.
+
+    Check if MaxScene containers includes any contents underneath.
+    """
+
+    order = pyblish.api.ValidatorOrder
+    families = ["camera",
+                "model",
+                "maxScene",
+                "review",
+                "pointcache",
+                "pointcloud",
+                "redshiftproxy"]
+    hosts = ["max"]
+    label = "Container Contents"
+
+    def process(self, instance):
+        if not instance.data["members"]:
+            raise PublishValidationError("No content found in the container")