Parse required parameters only once

xfel_calibrate/calibrate.py

@@ -272,7 +272,7 @@ elif len(sys.argv) >= 3:
                                         help=helpstr,
                                         required=required)
             
-        do_parse(nb, parser, True)
+        do_parse(nb, parser, (ext_func is not None))
         
         # extend parameters if needed
         ext_func = notebooks[detector][caltype].get("extend parms", None)