IF, Isblank, Vlookup, formula returns a zero instead of quoted text

[F4TMAN]

Any idea why this formula returns a zero instead of "none". Is there a formula i can incorporate that if the criteria isn't met, then do nothing like for example just leave the cell blank?

=IF(ISBLANK(A8)&Sheet7!L12>0,VLOOKUP(F3,Sheet7!J11:L13,3,FALSE),"none")

Thanks

 

[mohadin]

=IF(AND(ISBLANK(A8),Sheet7!L12>0),VLOOKUP(F3,Sheet7!J11:L13,3,FALSE),"none")

Or

=IF(AND(ISBLANK(A8),Sheet7!L12>0),VLOOKUP(F3,Sheet7!J11:L13,3,FALSE),"")