manage no argument set to script/cucchiaiata-cli commandline tool

script/cucchiaiata-cli

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/python3
 """Zephir-cmd-input script
 """
 from sys import exit, argv
@@ -10,7 +10,7 @@ from cucchiaiata.i18n import _
 
 def main():
     try:
-        if argv[1] in ['setting.session.server.configure',
+        if len(argv) > 2 and argv[1] in ['setting.session.server.configure',
                                           'setting.session.servermodel.configure']:
             Configuration().get()
         else: