Fix a bug when given only assemblies
Fix a bug when given only assemblies

jling90/SeqFindR,jling90/SeqFindR,BeatsonLab-MicrobialGenomics/SeqFindR,nbenzakour/SeqFindR,BeatsonLab-MicrobialGenomics/SeqFindR,nbenzakour/SeqFindR