Fixed MolDyn doctest

Refs #10391

Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/MolDyn.py

@@ -1,17 +1,10 @@
 from mantid.simpleapi import *
 from mantid.kernel import *
 from mantid.api import *
-from manitd import *
 
 import os
 import numpy as np
 
-from IndirectCommon import ExtractFloat, ExtractInt
-from IndirectNeutron import ChangeAngles, InstrParas, RunParas
-from IndirectImport import import_mantidplot
-
-MTD_PLOT = import_mantidplot()
-
 
 def _split_line(a):
     elements = a.split()  # split line on character
@@ -114,6 +107,12 @@ def validateInputs(self):
 
 
     def PyExec(self):
+        from IndirectCommon import ExtractFloat, ExtractInt
+        from IndirectNeutron import ChangeAngles, InstrParas, RunParas
+        from IndirectImport import import_mantidplot
+
+        self._mtd_plot = import_mantidplot()
+
         # Do setup
         self._setup()
 
@@ -166,7 +165,7 @@ def PyExec(self):
 
         # Plot contour plot
         if self._plot == 'Contour' or self._plot == 'Both':
-            MTD_PLOT.plot2D(self._out_ws)
+            self._mtd_plot.plot2D(self._out_ws)
 
 
     def _setup(self):