Merge branch 'master' of github.com:Ultimaker/Cura

cura/CuraApplication.py

@@ -851,7 +851,11 @@ class CuraApplication(QtApplication):
 
     def _reloadMeshFinished(self, job):
         # TODO; This needs to be fixed properly. We now make the assumption that we only load a single mesh!
-        job._node.setMeshData(job.getResult().getMeshData())
+        mesh_data = job.getResult().getMeshData()
+        if mesh_data:
+            job._node.setMeshData(job.getResult().getMeshData())
+        else:
+            Logger.log("w", "Could not find a mesh in reloaded node.")
 
     def _openFile(self, file):
         job = ReadMeshJob(os.path.abspath(file))

plugins/3MFReader/ThreeMFReader.py

@@ -111,6 +111,8 @@ class ThreeMFReader(MeshReader):
             if len(objects) > 1:
                 group_decorator = GroupDecorator()
                 result.addDecorator(group_decorator)
+            elif len(objects) == 1:
+                result = result.getChildren()[0] # Only one object found, return that.
         except Exception as e:
             Logger.log("e", "exception occured in 3mf reader: %s", e)