From 43c84c41f0fdef2f417c55d404e0be9604a66548 Mon Sep 17 00:00:00 2001
From: Adam Johnson <AdamJohnso@gmail.com>
Date: Mon, 1 Jan 2018 15:16:47 -0500
Subject: [PATCH] Detect invalid nodes in Plasma node trees

and don't raise seemingly random AttributeErrors!
---
 korman/nodes/node_core.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/korman/nodes/node_core.py b/korman/nodes/node_core.py
index 8d16f22..4d1bb8f 100644
--- a/korman/nodes/node_core.py
+++ b/korman/nodes/node_core.py
@@ -299,7 +299,11 @@ class PlasmaNodeTree(bpy.types.NodeTree):
     def harvest_actors(self):
         actors = set()
         for node in self.nodes:
-            actors.update(node.harvest_actors())
+            harvest_method = getattr(node, "harvest_actors", None)
+            if harvest_method is not None:
+                actors.update(harvest_method())
+            elif not isinstance(node, PlasmaNodeBase):
+                raise ExportError("Plasma Node Tree '{}' Node '{}': is not a valid node for this tree".format(self.id_data.name, node.name))
         return actors
 
     @classmethod