- tested & applied patch by Helios - fixes API inconsistence and removed NotFound Exceptions for: - layer.getInstance() - model.getObjects() NOTE: - model.getObject() returned 0 if no objects were found, whereas model.getObjects() throws an exception (-> inconsistent)

<Panel name="errorWindow" title="Error" min_size="300, 100">+
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	<ScrollArea>+
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		<Label name="message" text="Error:" wrap_text="1" vexpand="1"/>+
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	</ScrollArea>+
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	<Button name="okButton" text="OK"/>+
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</Panel>+
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