Empty mask in inputPassword

Hi Al,

When using an empty string (mask='') as a mask, stdiomask falls back on python's getpass resulting in printing the prompt after entering the password (on return), this is due to setting end='' in print.

To fix it, the orginal code (line 157..161) should be updated as follows:

```
# Get the user input.
if passwordMask is None:
userInput = input(prompt)
else:
userInput = stdiomask.getpass(prompt=prompt, mask=passwordMask)
```

regards