projectExpense return 0 instead of null

src/main/java/com/ffii/tsms/modules/data/service/DashboardService.kt

@@ -785,7 +785,7 @@ open class DashboardService(
                 + " left join ("
                 + " select"
                 + " t4.id as teamId,"
-                + " sum(pe.amount) as amount"
+                + " COALESCE(sum(pe.amount),0) as amount"
                 + " from team t4"
                 + " left join project p4 on t4.teamLead = p4.teamLead"
                 + " left join project_expense pe on pe.projectId = p4.id"
@@ -929,7 +929,7 @@ open class DashboardService(
                 + " ) as expenditure on 1=1."
                 + " left join ("
                 + " select"
-                + " sum(pe.amount) as amount"
+                + " COALESCE(sum(pe.amount),0) as amount"
                 + " from project p4"
                 + " left join project_expense pe on pe.projectId = p4.id"
                 + " where p4.status = 'On-going'"