Don't append $this->getEmptyString() to source#33

sheadawson merged 1 commit intosheadawson:1.0sheadawson/silverstripe-dependentdropdownfield:1.0from

PortableSteve:duplicate-empty-value-fixPortableSteve/silverstripe-dependentdropdownfield:duplicate-empty-value-fixCopy head branch name to clipboard