Merge pull request #16 from ytausch/fix-nullreference-bug

Fix: Configuration errors can now display again.

Author: JKamue

SchoolDisplay/SchoolDisplay/MainForm.cs

@@ -150,7 +150,10 @@ private void ShowError(string text)
             lblErrors.Text = text;
             lblErrors.Visible = true;
 
-            scroller.Stop();
+            if (scroller != null)
+            {
+                scroller.Stop();
+            }  
         }
 
         private void HideError()