fixed das drawing bug which over writes -ve strand features with non-stranded features
fixed das drawing bug which over writes -ve strand features with non-stranded features

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