Allow to paste empty string

[nullnull]

Problem

I can not paste empty string (to override existing cell value).

Cause

When pasting empty string "", !text returns true.

Solution

I think !text filter is no longer necessary, isn't it?

Thanks!

[coveralls]

Pull Request Test Coverage Report for Build 1036616370

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 69.214%

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Totals
Change from base Build 1020713119:	0.0%
Covered Lines:	236
Relevant Lines:	304

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💛 - Coveralls