Fix(prompt.py): #2994

[paperplane110]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Fix #2994

When using readline and Prompt.ask(), then just pressing enter, prompt won't break line. Questions will all be printed in one line.

So, if readline is imported and user just enter nothing, use print() to break line.