Handle NULL's received from the DB a bit more sanely with the newer Math::BigInt

lib/smradius/modules/accounting/mod_accounting_sql.pm

@@ -532,6 +532,14 @@ sub acct_log
 				qw(AcctInputOctets AcctInputPackets AcctOutputOctets AcctOutputPackets AcctInputGigawords AcctOutputGigawords
 					SessionTime PeriodKey)
 		)) {
+			# Make sure we treat undef values sort of sanely
+			$sessionPart->{'AcctInputGigawords'} //= 0;
+			$sessionPart->{'AcctInputOctets'} //= 0;
+			$sessionPart->{'AcctOutputGigawords'} //= 0;
+			$sessionPart->{'AcctOutputOctets'} //= 0;
+			$sessionPart->{'AcctInputPackets'} //= 0;
+			$sessionPart->{'AcctOutputPackets'} //= 0;
+			$sessionPart->{'AcctSessionTime'} //= 0;
 
 			# Convert this session usage to bytes
 			my $sessionInputBytes = Math::BigInt->new(0);