Fix preprocessStrandTable for the case where there are no sex contigs, so it still returns contigs full of NAs, but as factors with the correct number of levels so that the class validity checks still pass.
Fix preprocessStrandTable for the case where there are no sex contigs, so it still returns contigs full of NAs, but as factors with the correct number of levels so that the class validity checks still pass.

rareaquaticbadger/ContiBAIT,rareaquaticbadger/ContiBAIT,oneillkza/ContiBAIT,oneillkza/ContiBAIT