[Dune] [#220] Is it safe to call method father()?

[Dune]

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FS#220 - Is it safe to call method father()?
User who did this - Martin Nolte (nolte)

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I guess the hasFather() solution is good enough. For me, this would imply that father() is undefined if hasFather() == false. Returning the entity itself (as a defined behaviour) is a bad solution in my opinion (think of the vertical load balancing example, here).
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