VBA ignore blank cells

[Ninnut85]

Here is my code to create outlook calendar reminders:

Option Explicit
Public Sub CreateOutlookAppointments()
Sheets("Sheet1").Visible = True
Application.ScreenUpdating = False
   Sheets("Sheet1").Select
    On Error GoTo Err_Execute
     
    Dim olApp As Outlook.Application
    Dim olAppt As Outlook.AppointmentItem
    Dim blnCreated As Boolean
    Dim olNs As Outlook.Namespace
    Dim CalFolder As Outlook.MAPIFolder
     
    Dim i As Long
     
    On Error Resume Next
    Set olApp = Outlook.Application
     
    If olApp Is Nothing Then
        Set olApp = Outlook.Application
         blnCreated = True
        Err.Clear
    Else
        blnCreated = False
    End If
     
    On Error GoTo 0
     
    Set olNs = olApp.GetNamespace("MAPI")
    Set CalFolder = olNs.GetDefaultFolder(olFolderCalendar)
         
    i = 2
    Do Until Trim(Cells(i, 1).Value) = ""
    Set olAppt = CalFolder.Items.Add(olAppointmentItem)
           
    With olAppt
     
    'Define calendar item properties
        .Start = Cells(i, 5) + Cells(i, 6)
        .End = Cells(i, 7) + Cells(i, 8)
        .Subject = Cells(i, 1)
        .Location = Cells(i, 2)
        .Body = Cells(i, 3)
        .BusyStatus = olBusy
        .ReminderMinutesBeforeStart = Cells(i, 9)
        .ReminderSet = True
        .Categories = Cells(i, 4)
        .Save
' For meetings or Group Calendars
     ' .Send
    End With
                 
        i = i + 1
        Loop
    Set olAppt = Nothing
    Set olApp = Nothing
    Sheets("Sheet1").Visible = False
    Application.ScreenUpdating = True
     
    Exit Sub
     
Err_Execute:
    MsgBox "An error occurred - Exporting items to Calendar."
     
End Sub

The issue I need help with is I need it so if it finds a blank cell in the 'start' and 'end' columns it ignores them and creates the appointments for the cells that do have dates.Basically, I have a formula in those boxes where it displays a date if another cell has been populated but will display "" (blank) if the other cell hasn't been populated.
How can I get this to work where it will ignore any cells with no dates in them? When the cells are blank, the macro just errors.
For example, in the screen shot, If cell E10 is empty because the formula has not found a date in the other sheet, how can I make it so this will ignore the empty cell and generate the appointments for the dates that are populated?

Many thanks,