The function convertEnsemblToNames.py get error!

[EddieLv]

Hi! : )
When I check the script, I found that error caused by this part [line 23-26]:

loads a map with the ensembl ids -> gene name

gene_map = dict()
for line in gff_lines(annotation):
    gene_map[line["gene_id"]] = line["gene_name"]

I think this is because some genes from ensemble gtf file have not gene_name, this is a small bug.
And another question is that, some gene ids refer to one gene name, it seems the script only transfer one of the gene id to the gene name, I wonder if it is acceptable.