fmk - fix REWET_Wrapper, incorrect arg name used, bug if mpi4py present

Author: fmckenna

modules/systemPerformance/REWET/REWET_Wrapper.py

@@ -482,7 +482,7 @@ def create_path(path):
 
     mpi_spec = importlib.util.find_spec('mpi4py')
     found = mpi_spec is not None
-    if found and arg_parser.par:
+    if found and parser_data.par:
         from mpi4py import MPI
 
         comm = MPI.COMM_WORLD