minor fix in pd mode

Author: srmnitc

calphy/clitools.py

@@ -125,4 +125,5 @@ def phase_diagram():
     arg = ap.ArgumentParser()
     arg.add_argument("-i", "--input", required=True, type=str,
     help="name of the input file")
+    args = vars(arg.parse_args())
     prepare_inputs_for_phase_diagram(args['input'])