Database: fix missing message on exception

Database/Adapters/MSSQLServer.vb

@@ -111,7 +111,7 @@ Public Class MSSQLServer
 
     Private Function MaybeGetTransaction(Connection As SqlConnection, Mode As TransactionMode, Transaction As SqlTransaction) As SqlTransaction
         If Connection Is Nothing Then
-            Throw New ArgumentNullException("Connection")
+            Throw New ArgumentNullException("Connection", "Could not get transaction because connection is null!")
         End If
 
         If Mode = TransactionMode.NoTransaction Then
@@ -269,7 +269,7 @@ Public Class MSSQLServer
         Try
             If pConnectionString Is Nothing OrElse pConnectionString.Length = 0 Then
                 Logger.Warn("Connection String is empty!")
-                Throw New ArgumentNullException("pConnectionString")
+                Throw New ArgumentNullException("pConnectionString", "Could not mask connection string because connectiong string is empty!")
             End If
 
             Dim oBuilder As New SqlConnectionStringBuilder() With {.ConnectionString = pConnectionString}