[ENSCORESW-667]. Return empty anonymous array in case _ise_array attribute is undefined.
[ENSCORESW-667]. Return empty anonymous array in case _ise_array attribute is undefined.

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