FINERACT-1954: Waive null pointer and due date fix

- [x] Fix Waive due date handle
- [x] Fix null pointer exception
- [x] Integration test

fineract-provider/src/main/java/org/apache/fineract/portfolio/loanaccount/domain/transactionprocessor/AbstractLoanRepaymentScheduleTransactionProcessor.java

@@ -209,7 +209,6 @@ public abstract class AbstractLoanRepaymentScheduleTransactionProcessor implemen
             }
         }
         reprocessInstallments(installments, currency);
-
         return changedTransactionDetail;
     }