Fix random/switch node.

Normand Briere

2019-05-01 d1e1417edc8a6ccf195b6da3270f22234dda61e4

 timeflow/app/actions/AddFieldAction.java
..
..
@@ -32,7 +32,7 @@
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 		if (n==1)
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 		{
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 			String fieldName=p.name.getText();
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-			TFModel model=getModel();
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+			TimeflowModel model=getModel();
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 			if (fieldName.trim().length()==0)
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 				app.showUserError("Field names can't be all spaces!");
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 			else if (model.getDB().getField(fieldName)!=null)