changed _fetch to return empty arrayref if it can't get a db handle as other subs assume the return value will always be arrayref
changed _fetch to return empty arrayref if it can't get a db handle as other subs assume the return value will always be arrayref

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode