A warning more verbose, allow no alias, formatting
A warning more verbose, allow no alias, formatting

Other than some very minor formatting changes, the two changes here:
a) make a warning more verbose (I missed the meaning of the output)
b) allow the config file to have no alias value without causing an error.
at7/ensembl,mjg17/ensembl,at7/ensembl,Ensembl/ensembl,Ensembl/ensembl,danstaines/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,muffato/ensembl,danstaines/ensembl,at7/ensembl,muffato/ensembl,Ensembl/ensembl,danstaines/ensembl,mjg17/ensembl,muffato/ensembl,mjg17/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,mjg17/ensembl,Ensembl/ensembl,at7/ensembl,muffato/ensembl