fixed --help on top level

Author: chrisgorgo

bin/nipype_cmd

@@ -48,7 +48,7 @@ def run_instance(interface, options):
 
 def parse_args():
 
-    if len(sys.argv) == 2:
+    if len(sys.argv) == 2 and not sys.argv[1].startswith("-"):
         listClasses(sys.argv[1])
         return