PT init method `TEXT` with no init_text returns ZeroDivisionError

[gkumbhat]

Describe the bug

When trying to run prompt tuning with init method as TEXT but no init_text, currently it returns ZeroDivisionError.. Technically this is a problem with the input parameters being passed for PT, but the error message is not clear.

Action Item:

• Improve error message in case when init method is TEXT but no init_text is provided.