Merge pull request #93 from shyba/fix/help-messages

Fix/help messages

Author: fabianp

mprof

@@ -431,6 +431,7 @@ def plot_action():
                   "mprofile_*.dat files, generated by the "
                   "'mprof run' command.")
             sys.exit(-1)
+        print("Using last profile data.")
         filenames = [profiles[-1]]
     else:
         filenames = []
@@ -441,10 +442,13 @@ def plot_action():
             else:
                 try:
                     n = int(arg)
+                    if not profiles[n] in filenames:
+                        filenames.append(profiles[n])
                 except ValueError:
                     print("Input file not found: " + arg)
-                if not profiles[n] in filenames:
-                    filenames.append(profiles[n])
+    if not len(filenames):
+        print("No files found from given input.")
+        sys.exit(-1)
 
     pl.figure(figsize=(14, 6), dpi=90)
     if len(filenames) > 1 or options.no_timestamps: