Handling of Incertae sedis output from genbank

[jacobcook1995]

Genbank style taxonomy output creates output for taxa of uncertain placement in the following format f_Sordariales_fam_Incertae_sedis, at the moment this fails because searching the NCBI database for e.g. Sordariales_fam_Incertae_sedis doesn't yield any sensible results.

In reality, ranks like this should be ignored, as there's no specific claim being made, but not if it's the lowest level rank populated