Fix saving task with reminder related to due date

NEWS

@@ -17,6 +17,7 @@ Bug fixes
  - [web] enable save button when editing the members of a list
  - [web] restore caret position when replying or forwarding a message (#4517)
  - [web] localized special mailboxes names in filter editor
+ - [web] fixed saving task with reminder based on due date
 
 4.0.1 (2018-07-10)
 ------------------

SoObjects/Appointments/iCalToDo+SOGo.m

@@ -132,10 +132,7 @@
   if (startDate)
     [self setStartDate: startDate];
   else
-    {
     [self setStartDate: nil];
-      [self removeAllAlarms];
-    }
 
   // Handle due date
   isAllDayDueDate = YES;
@@ -158,6 +155,9 @@
   else
     [self setDue: nil];
 
+  if (!startDate && !dueDate)
+    [self removeAllAlarms];
+
   // Handle time zone
   todoStartDate = (iCalDateTime *)[self uniqueChildWithTag: @"dtstart"];
   todoDueDate = (iCalDateTime *)[self uniqueChildWithTag: @"due"];