If a posting's amount is null, return 0L
If a posting's amount is null, return 0L

duncanmortimer/ledger,ledger/ledger,ledger/ledger,jwakely/ledger,duncanmortimer/ledger,afh/ledger,afh/ledger,paulbdavis/ledger,duncanmortimer/ledger,jwakely/ledger,jwakely/ledger,jwakely/ledger,ledger/ledger,afh/ledger,paulbdavis/ledger,duncanmortimer/ledger,paulbdavis/ledger,paulbdavis/ledger,afh/ledger,duncanmortimer/ledger,duncanmortimer/ledger,duncanmortimer/ledger,ledger/ledger,paulbdavis/ledger,paulbdavis/ledger,afh/ledger,jwakely/ledger,jwakely/ledger,jwakely/ledger,ledger/ledger,paulbdavis/ledger