Update EM_FDEM_SusEffects.py

if mumps import fails use LU

SimPEG/Examples/EM_FDEM_SusEffects.py

@@ -1,8 +1,13 @@
 from SimPEG import *
 from SimPEG import EM
-from pymatsolver import MumpsSolver
 from scipy.constants import mu_0
 
+try:
+    from pymatsolver import MumpsSolver
+    prb.Solver = MumpsSolver
+except ImportError, e:
+    prb.Solver = SolverLU
+
 def run(plotIt=True):
     """
         EM: FDEM: Effects of susceptibility