Skip over richtextbox value if it does not exist

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VB

Originally Richard helped me with the first portion of my problem which was parsing the richtextbox data.

here is the code:

Dim rows() As String = Regex.Split(RichTextBox1.Text, "^\r?$", RegexOptions.Multiline)
       Dim pattern As New Regex("^\s*(?<label>[^:]+)\s*:\s*(?<value>.+)\s*\r?$", RegexOptions.Multiline)

       For Each row As String In rows
           Dim lastName As String = Nothing, firstName As String = Nothing, race As String = Nothing, sex As String = Nothing
           Dim matches As MatchCollection = pattern.Matches(row)
           For Each match As Match In matches
               Dim label As String = match.Groups("label").Value
               If String.Equals(label, "last Name", StringComparison.OrdinalIgnoreCase) Then
                   lastName = match.Groups("value").Value

               ElseIf String.Equals(label, "First Name", StringComparison.OrdinalIgnoreCase) Then
                   firstName = match.Groups("value").Value


               ElseIf String.Equals(label, "Race", StringComparison.OrdinalIgnoreCase) Then
                   race = match.Groups("value").Value

               ElseIf String.Equals(label, "Sex", StringComparison.OrdinalIgnoreCase) Then

               End If

           Next

I have been trying to work on the 2nd portion of my problem. Now to make the process skip over a value if it is not present.

so let's say I have -

First Name: jeff
last Name: jones
Race: B

First Name: steve
last Name: need

First Name: lance
Sex: M
Race: W

you can see in these examples have other fields that others do not. I want to skip over the information that is not present, possibly even put a blank string "" in just to move the process along.

What I have tried:

I have tried the value =

Match.Empty.Value

I have tried to use the skip command, but I just keep getting a null reference error.