Preventing error when account has no transactions
Preventing error when account has no transactions

`ynabToolKit.shared.getVisibleTransactions(accountId)` now has the
`transactions` variable default to an empty array instead of null.

dbaldon/toolkit-for-ynab,ahatzz11/toolkit-for-ynab,falkencreative/toolkit-for-ynab,toolkit-for-ynab/toolkit-for-ynab,gpeden/ynab-enhanced,gpeden/ynab-enhanced,falkencreative/toolkit-for-ynab,gpeden/ynab-enhanced,blargity/toolkit-for-ynab,ahatzz11/toolkit-for-ynab,dbaldon/toolkit-for-ynab,egens/toolkit-for-ynab,toolkit-for-ynab/toolkit-for-ynab,toolkit-for-ynab/toolkit-for-ynab,ahatzz11/toolkit-for-ynab,egens/toolkit-for-ynab,egens/toolkit-for-ynab,joshmadewell/toolkit-for-ynab,toolkit-for-ynab/toolkit-for-ynab,dbaldon/toolkit-for-ynab,falkencreative/toolkit-for-ynab,joshmadewell/toolkit-for-ynab,joshmadewell/toolkit-for-ynab,blargity/toolkit-for-ynab,gpeden/ynab-enhanced,dbaldon/toolkit-for-ynab,egens/toolkit-for-ynab,joshmadewell/toolkit-for-ynab,falkencreative/toolkit-for-ynab,blargity/toolkit-for-ynab,blargity/toolkit-for-ynab,ahatzz11/toolkit-for-ynab