micplot requires X window

[simonrharris]

By default matplotlib uses an X window backend. micplot will therefore die if one isn't available. Can be fixed by adding this before any pyplot import

import matplotlib
matplotlib.use('Agg')

[martinghunt]

I'll get round to doing this soon (unless you want to send a PR ;) ) but I think for now this will fix it:
export MPLBACKEND="agg".

[andrewjpage]

Fixed in v2.10.4