[FIX] Admin cannot clear user details like bio or nickname

[yash-rajpal]

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Proposed changes (including videos or screenshots)

When the API users.update is called to update user data, it passes data to saveUser function. Here before saving data like bio or nickname we are checking if they are available or not. If data is available then we are saving it, but we are not doing anything when data isn't available.

So unsetting data if data isn't available to save. Will also fix bio and other fields. :)

Issue(s)

fixes #20783

Steps to test or reproduce

Further comments

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