Catch OSError when actually writing the UFP stream

This includes getting an error message when we don't have write access any more or when the file was deleted or connection lost while we were writing to it.

Fixes Sentry issue CURA-GX.

plugins/UFPWriter/UFPWriter.py

@@ -1,4 +1,4 @@
-#Copyright (c) 2019 Ultimaker B.V.
+#Copyright (c) 2020 Ultimaker B.V.
 #Cura is released under the terms of the LGPLv3 or higher.
 
 from typing import cast
@@ -131,5 +131,11 @@ class UFPWriter(MeshWriter):
 
             added_materials.append(material_file_name)
 
-        archive.close()
+        try:
+            archive.close()
+        except OSError as e:
+            error_msg = catalog.i18nc("@info:error", "Can't write to UFP file:") + " " + str(e)
+            self.setInformation(error_msg)
+            Logger.error(error_msg)
+            return False
         return True