removed duplicate store method does not store density feature with value of 0
removed duplicate store method
does not store density feature with value of 0

Ensembl/ensembl,Ensembl/ensembl,muffato/ensembl,mjg17/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,at7/ensembl,james-monkeyshines/ensembl,muffato/ensembl,at7/ensembl,james-monkeyshines/ensembl,mjg17/ensembl,danstaines/ensembl,muffato/ensembl,mjg17/ensembl,muffato/ensembl,mjg17/ensembl,willmclaren/ensembl,danstaines/ensembl,willmclaren/ensembl,at7/ensembl,at7/ensembl,james-monkeyshines/ensembl,danstaines/ensembl