- if global_options.from_version:
- from_version = global_options.from_version
- else:
- guess = guess_lilypond_version (input)
- if not guess:
- raise UnknownVersion ()
- from_version = str_to_tuple (guess)
+ org_version = None
+ guess = guess_lilypond_version (input)
+ org_version = guess and str_to_tuple (guess)
+ from_version = global_options.from_version or org_version
+ if not from_version:
+ raise UnknownVersion ()