tiny tweaks to test.

moose-core/tests/python/test_muparser.py

@@ -8,15 +8,12 @@ Modified from https://elifesciences.org/articles/25827 , Fig4.py
 import sys
 import os
 import numpy as np
-import matplotlib as mpl
-mpl.use('Agg')
 import sys
 import numpy as np
 import moose
 import abstrModelEqns9 as ame
 import rdesigneur as rd
 
-
 def singleCompt( name, params ):
     mod = moose.copy( '/library/' + name + '/' + name, '/model' )
     A = moose.element( mod.path + '/A' )