Prevent crash on running NextColumn element.

- FEHLERBEHEBUNG: Kein Absturz mehr, wenn zwei Spalten formatiert werden.

zaaReloaded2/Formatter/Formatter.cs

@@ -121,6 +121,14 @@ namespace zaaReloaded2.Formatter
         {
             if (!CanRun) throw new NoLaboratoryDataException("No laboratory data to format.");
 
+            // Create undo record and styles prior to iterating over the elements
+            // because a column switching element might trigger output to the
+            // document.
+            Globals.ThisAddIn.Application.UndoRecord.StartCustomRecord(
+                String.Format("Laborformatierung ({0})", Properties.Settings.Default.AddinName)
+                );
+            CreateStyles();
+
             int current = 0;
             while (current < Settings.Elements.Count)
             {
@@ -146,11 +154,6 @@ namespace zaaReloaded2.Formatter
                 }
             }
 
-            // Write everything to the Word document
-            Globals.ThisAddIn.Application.UndoRecord.StartCustomRecord(
-                String.Format("Laborformatierung ({0})", Properties.Settings.Default.AddinName)
-                );
-            CreateStyles();
             _secondaryBuffer.Flush();
             Globals.ThisAddIn.Application.UndoRecord.EndCustomRecord();
         }