Fix GCodeReader-feature related _readMeshfinished to match changes upstream.

The job.getResult() now returns a list of nodes now, so we need to loop
over those nodes instead of taking it as a single node value.

cura/CuraApplication.py

@@ -1056,11 +1056,11 @@ class CuraApplication(QtApplication):
         job.start()
 
     def _readMeshFinished(self, job):
-        node = job.getResult()
+        nodes = job.getResult()
         filename = job.getFileName()
         self._currently_loading_files.remove(filename)
 
-        if node != None:
+        for node in nodes:
             node.setSelectable(True)
             node.setName(os.path.basename(filename))
 

plugins/3MFReader/ThreeMFReader.py

@@ -1,7 +1,6 @@
 # Copyright (c) 2015 Ultimaker B.V.
 # Cura is released under the terms of the AGPLv3 or higher.
 
-import math
 import os.path
 import zipfile