payments: don't return username if it's empty
payments: don't return username if it's empty

jack89129/koding,andrewjcasal/koding,drewsetski/koding,mertaytore/koding,usirin/koding,cihangir/koding,mertaytore/koding,sinan/koding,alex-ionochkin/koding,drewsetski/koding,szkl/koding,cihangir/koding,acbodine/koding,usirin/koding,drewsetski/koding,sinan/koding,kwagdy/koding-1,usirin/koding,rjeczalik/koding,sinan/koding,mertaytore/koding,rjeczalik/koding,gokmen/koding,acbodine/koding,sinan/koding,szkl/koding,acbodine/koding,acbodine/koding,kwagdy/koding-1,andrewjcasal/koding,mertaytore/koding,usirin/koding,rjeczalik/koding,koding/koding,alex-ionochkin/koding,alex-ionochkin/koding,cihangir/koding,koding/koding,andrewjcasal/koding,rjeczalik/koding,kwagdy/koding-1,kwagdy/koding-1,jack89129/koding,sinan/koding,gokmen/koding,jack89129/koding,gokmen/koding,gokmen/koding,mertaytore/koding,rjeczalik/koding,kwagdy/koding-1,usirin/koding,usirin/koding,koding/koding,mertaytore/koding,jack89129/koding,andrewjcasal/koding,drewsetski/koding,koding/koding,sinan/koding,rjeczalik/koding,kwagdy/koding-1,rjeczalik/koding,szkl/koding,andrewjcasal/koding,acbodine/koding,jack89129/koding,szkl/koding,koding/koding,sinan/koding,alex-ionochkin/koding,acbodine/koding,andrewjcasal/koding,mertaytore/koding,cihangir/koding,cihangir/koding,acbodine/koding,alex-ionochkin/koding,acbodine/koding,szkl/koding,drewsetski/koding,cihangir/koding,rjeczalik/koding,koding/koding,andrewjcasal/koding,alex-ionochkin/koding,alex-ionochkin/koding,koding/koding,szkl/koding,alex-ionochkin/koding,jack89129/koding,cihangir/koding,kwagdy/koding-1,gokmen/koding,usirin/koding,cihangir/koding,jack89129/koding,drewsetski/koding,drewsetski/koding,mertaytore/koding,jack89129/koding,kwagdy/koding-1,szkl/koding,usirin/koding,koding/koding,gokmen/koding,gokmen/koding,sinan/koding,szkl/koding,andrewjcasal/koding,gokmen/koding,drewsetski/koding