Connecting with an empty password

## Specifying an empty password assumes no password.

When I try add a MySQL connection with an empty password it assumes no password is being used and I get an error:
`Error: ER_ACCESS_DENIED_ERROR: Access denied for user '****:****' (using password: NO)`

If I specify an invalid password (not empty), I get:
`Error: ER_ACCESS_DENIED_ERROR: Access denied for user '****:****' (using password: YES)`

There's no way for me to specify that I want to use a password, but that the password is an empty string.