Re #7950. Remove barrier to starting reduction gui outside MantidPlot.

There are other places with an unguarded import of MantidPlot, but this
one is trivial to fix.

Code/Mantid/scripts/Interface/reduction_gui/reduction/output_script.py

@@ -1,11 +1,11 @@
 from scripter import BaseScriptElement
-from mantid.api import AnalysisDataService
 
 # Check whether we are running in MantidPlot
 IS_IN_MANTIDPLOT = False
 try:
     import mantidplot
     IS_IN_MANTIDPLOT = True
+    from mantid.api import AnalysisDataService
 except:
     pass
 
@@ -34,4 +34,4 @@ def update(self):
                     if len(iq_plots)>0:
                         mantidplot.plotSpectrum(iq_plots, 0, True)
             except:
-                raise RuntimeError, "Could not plot resulting output\n  %s" % sys.exc_value
+                raise RuntimeError, "Could not plot resulting output\n  %s" % sys.exc_value