one more change to the numpy code. last commit was bad

wrappers/python/src/swig_doxygen/swig_lib/python/pythoncode.i

@@ -274,15 +274,15 @@ def stripUnits(args):
     """
     newArgList=[]
     for arg in args:
-        if unit.is_quantity(arg):
+        if 'numpy' in sys.modules and isinstance(arg, numpy.ndarray):
+           arg = arg.tolist()
+        elif unit.is_quantity(arg):
             # JDC: Ugly workaround for OpenMM using 'bar' for fundamental pressure unit.
             if arg.unit.is_compatible(unit.bar):
                 arg = arg / unit.bar
             else:
                 arg=arg.value_in_unit_system(unit.md_unit_system)                
             # JDC: End workaround.
-            if 'numpy' in sys.modules and isinstance(arg, numpy.ndarray):
-                arg = arg.tolist()
         elif isinstance(arg, dict):
             newKeys = stripUnits(arg.keys())
             newValues = stripUnits(arg.values())