Crash when entering blank string after creating database.

[dotancohen]

After creating a new database, with no context such as a "Database created!" message (since added) I simply pressed Enter at the unlabeled prompt. This caused a crash:

$ ./burton.py 

Welcome to Burton 0.1.1!

Please select an operation:
 1. Operating system statistics
 2. Configure and maintain operating system
 3. Configure websites
 4. Configure email
 5. Configure databases
 6. Install applications
 9. View Help, About, License, and Copyright pages
 -. Exit
>> 5

Configure Databases

Please select an operation:
 1. Add/Remove database
 2. Add/Remove users
 3. Backup databases
 0. Go Back
 -. Exit
>> 1

Manage databases

Available databases:
 1. wordpress_clean
 2. Create New Database
 0. Go Back
 -. Exit
>> 2

Create new database

Please enter a new database name:
>> east_west

Database created!   // Actually wasn't here, but I added it to the code so I add it here for reference.

>> 
Traceback (most recent call last):
  File "./burton.py", line 108, in <module>
    main(sys.argv)
  File "./burton.py", line 86, in main
    configure_databases.main(env)
  File "/home/dotancohen/burton/configure_databases.py", line 41, in main
    manage_databases()
  File "/home/dotancohen/burton/configure_databases.py", line 85, in manage_databases
    elif int(operation)-1 == new_db_index:
ValueError: invalid literal for int() with base 10: ''