UnboundLocalError in vmdk.py when disk image conversion errors

[glennmatthews]

Traceback (most recent call last):
  File "cot", line 66, in <module>
    COT.ui.cli.main()
  File "COT/ui/cli.py", line 717, in main
    CLI().run(sys.argv[1:])
  File "COT/ui/cli.py", line 324, in run
    return self.main(args)
  File "COT/ui/cli.py", line 601, in main
    args.instance.run()
  File "COT/commands/add_disk.py", line 210, in run
    description=self.description)
  File "COT/commands/add_disk.py", line 581, in add_disk_worker
    disk_image = vm.convert_disk_if_needed(disk_image, drive_type)
  File "COT/vm_description/ovf/ovf.py", line 1893, in convert_disk_if_needed
    new_directory=self.working_dir)
  File "COT/disks/disk.py", line 193, in convert_to
    return subclass.from_other_image(self, new_directory, new_subformat)
  File "COT/disks/vmdk.py", line 112, in from_other_image
    os.remove(temp_image.path)
UnboundLocalError: local variable 'temp_image' referenced before assignment

                    try:
                        temp_image = RAW.from_other_image(input_image,
                                                          output_dir)
                        return cls.from_other_image(temp_image,
                                                    output_dir,
                                                    output_subformat)
                    finally:
                        os.remove(temp_image.path)

RAW.from_other_image raised an error (in this particular case, due to disk space exhaustion) and so temp_image was not yet set.