I have multiple criteria's & one may be blanks, how to skip blank criteria in formula?

[Tony O]

I have multiple criteria's & one may be blanks, how to skip blank criteria in formula?
Below is formula that works with no blank cell criteria's
=INDEX($G$2:$G$50,MATCH(1,INDEX((J2=$C$2:$C$50)*(J16=$D$2:$D$50)*(J17=$E$2:$E$50)*(J18=$E$2:$E$50)*(J19=$F$2:$F$50),0,1),0))

If cell J2 is blank how to correct above formula see below?
(J2=$C$2:$C$50

& can it work on multipile blank cirteria's?

Regards

Tony O

 

[Peter_SSs]

I'm not sure that clearly answered either of my questions.
In any case, what about @awoohaw's repeated request for some XL2BB sample data (& expected results would help too)