[bugfix] init cratetime when it is null

atms-api/src/main/java/pwc/taxtech/atms/dto/vatdto/InvoiceMappingDto.java

@@ -22,7 +22,7 @@ public class InvoiceMappingDto {
         invoiceMapping.setInvoiceNumber(InvoiceNumber);
         invoiceMapping.setPeriod(Period);
         invoiceMapping.setCreatorID(CreatorID);
-        invoiceMapping.setCreateTime(CreateTime);
+        invoiceMapping.setCreateTime(CreateTime == null ? new Date() : CreateTime);
         return invoiceMapping;
     }
 }