Check arguments before logging in run_action.

Author: nvdv

mprof

@@ -199,13 +199,14 @@ def run_action():
                       help="""Monitors forked processes as well (sum up all process memory)""")
 
     (options, args) = parser.parse_args()
-    print("{1}: Sampling memory every {0.interval}s".format(
-        options, osp.basename(sys.argv[0])))
 
     if len(args) == 0:
         print("A program to run must be provided. Use -h for help")
         sys.exit(1)
 
+    print("{1}: Sampling memory every {0.interval}s".format(
+        options, osp.basename(sys.argv[0])))
+
     ## Output results in a file called "mprofile_<YYYYMMDDhhmmss>.dat" (where
     ## <YYYYMMDDhhmmss> is the date-time of the program start) in the current
     ## directory. This file contains the process memory consumption, in Mb (one