Delay import of `midi' module. (issue 297420043 by address@hidden)

[dak]

https://codereview.appspot.com/297420043/diff/1/scripts/midi2ly.py
File scripts/midi2ly.py (right):

https://codereview.appspot.com/297420043/diff/1/scripts/midi2ly.py#newcode925
scripts/midi2ly.py:925: import midi
Doesn't this merely work by chance?

If running the script depends on the midi module being compiled, the
solution would obviously be to tell that to Make with an appropriate
dependency.

https://codereview.appspot.com/297420043/