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Question: Maple returns an empty solution

Question:Maple returns an empty solution

DimaBrt 105 Maple 2018
fsolve
December 06 2021
2

Hello. I want to organize some parameter
F=fsolve(1+x^2=j).

If j=-5, for example, an empty value 'F=' will be returned. How can I write the expression

If F=(void), then action 1, else action 2 end if

The fact is that I just don't know how to write the result (void), that is, the result of 'F ='

Thanks
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