# HG changeset patch
# User Chris Cannam
# Date 1563358808 -3600
# Node ID b43ff1abdc020f0a1eb3ee72141a8c4539f0673c
# Parent  3943d0720167556c2b984b3500ff2cf1597a2da8
Fix inability to set layer's model to None

diff -r 3943d0720167 -r b43ff1abdc02 layer/LayerFactory.h
--- a/layer/LayerFactory.h	Mon Jul 15 13:49:57 2019 +0100
+++ b/layer/LayerFactory.h	Wed Jul 17 11:20:08 2019 +0100
@@ -104,8 +104,10 @@
     bool trySetModel(Layer *layerBase, ModelId modelId) {
         LayerClass *layer = dynamic_cast<LayerClass *>(layerBase);
         if (!layer) return false;
-        auto model = ModelById::getAs<ModelClass>(modelId);
-        if (!model) return false;
+        if (!modelId.isNone()) {
+            auto model = ModelById::getAs<ModelClass>(modelId);
+            if (!model) return false;
+        }
         layer->setModel(modelId);
         return true;
     }