Deleting rows make script go in a loop - excel

Question

I use this piece of code to delete any blank rows in my excel file and then adjust the structure so there won't be a blank hole in the file.
But I found out that this part of the code put my script in an infinite loop.
Does somebody know what I can change to stop this piece of code let my script go in an infinite loop or is there maybe a better way to delete blank rows?
Dim LastRowIndex As Integer
Dim RowIndex As Integer
Dim UsedRng As Range
Set UsedRng = ActiveSheet.UsedRange
LastRowIndex = UsedRng.Row - 1 + UsedRng.Rows.Count
Application.ScreenUpdating = False
For RowIndex = LastRowIndex To 1 Step -1
If Application.CountA(Rows(RowIndex)) = 0 Then
Rows(RowIndex).Delete
End If
Next RowIndex
Application.ScreenUpdating = False
Dim n As Long
The hole code looks like:
Dim cell As Range
lastRow = ActiveSheet.Cells(ActiveSheet.Rows.Count, "C").End(xlUp).Row
For Each cell In ActiveSheet.Range("C2:C" & lastRow)
S = vbNullString
If cell.Value <> vbNullString Then
v = Split(cell.Value, " ")
For Each W In v
S = S & Left$(W, 1) & "."
Next W
cell.Offset(ColumnOffset:=-1).Value = S
End If
Next cell
Application.Range("B1").Value = "tesing"
Worksheets("sheet1").Range("B1").Font.Bold = True
Columns("D").Replace What:="vander", _
Replacement:="van der", _
LookAt:=xlPart, _
SearchOrder:=xlByRows, _
MatchCase:=False, _
SearchFormat:=False, _
ReplaceFormat:=False
Columns("D").Replace What:="vanden", _
Replacement:="van den", _
LookAt:=xlPart, _
SearchOrder:=xlByRows, _
MatchCase:=False, _
SearchFormat:=False, _
ReplaceFormat:=False
Columns("B").Replace What:="..", _
Replacement:=".", _
LookAt:=xlPart, _
SearchOrder:=xlByRows, _
MatchCase:=False, _
SearchFormat:=False, _
ReplaceFormat:=False
'Beta code'
Dim r As Range
For Each r In ActiveSheet.UsedRange
If Not IsError(r.Value) Then
v = r.Value
If v <> vbNullString Then
If Not r.HasFormula Then
r.Value = Trim(v)
End If
End If
End If
Next r
'NIEUW NIEUW NIEUW NIEUW NIEUW NIEUW NIEUW NIEUW '
ActiveWorkbook.Worksheets("sheet1").Range("A2:Z5000").Font.Bold = False
ThisWorkbook.ActiveSheet.Cells.Range("A2:Z5000").ClearFormats
Range("A1:Z5000").Font.Color = vbBlack
Range("G2:G5000,A2:A5000,H2:H5000").Clear
Worksheets("sheet1").Columns("A:M").AutoFit
Application.EnableEvents = True
Application.ScreenUpdating = True
Application.Calculation = xlCalculationAutomatic
End Sub
Option Explicit
Private Sub Worksheet_Change(ByVal Target As Range)
Const RolesList As String = "Testing"
Const FirstCellAddress As String = "L2"
Const Delimiter As String = "||"
Dim rng As Range
With Range(FirstCellAddress)
Set rng = Intersect(.Resize(.Worksheet.Rows.Count - .Row + 1), Target)
End With
If rng Is Nothing Then
Exit Sub
End If
Dim Roles() As String: Roles = Split(RolesList, ",")
Dim dRng As Range
Dim aRng As Range
Dim cel As Range
Dim Curr() As String
Dim cMatch As Variant
Dim n As Long
Dim isFound As Boolean
For Each aRng In rng.Areas
For Each cel In aRng.Cells
If Not IsError(cel) Then
Curr = Split(cel.Value, Delimiter)
For n = 0 To UBound(Curr)
cMatch = Application.Match(Curr(n), Roles, 0)
If IsError(cMatch) Then
isFound = True
Exit For
Else
' Remove this block if you don't need case-sensitivity.
If StrComp(Curr(n), Roles(cMatch - 1), _
vbBinaryCompare) <> 0 Then
isFound = True
Exit For
End If
End If
Next n
If isFound Then
isFound = False
If dRng Is Nothing Then
Set dRng = cel
Else
Set dRng = Union(dRng, cel)
End If
End If
End If
Next cel
Next aRng
Application.ScreenUpdating = False
rng.Interior.Color = xlNone
If Not dRng Is Nothing Then
dRng.Interior.Color = vbRed
End If
Application.ScreenUpdating = True
End Sub

Answer 1

I replaced the code above with, it works now:
Application.EnableEvents = True
Application.ScreenUpdating = True
Application.Calculation = xlCalculationAutomatic
Dim i As Long
Dim DelRange As Range
On Error GoTo Whoa
Application.ScreenUpdating = False
For i = 1 To 50
If Application.WorksheetFunction.CountA(Range("A" & i & ":" & "Z" & i)) = 0 Then
If DelRange Is Nothing Then
Set DelRange = Range("A" & i & ":" & "Z" & i)
Else
Set DelRange = Union(DelRange, Range("A" & i & ":" & "Z" & i))
End If
End If
Next i
If Not DelRange Is Nothing Then DelRange.Delete shift:=xlUp
LetsContinue:
Application.ScreenUpdating = True
Exit Sub
Whoa:
MsgBox Err.Description
Resume LetsContinue