easim.core.History needs a fix
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#1 easim.core.History needs a fix
easim.core.History.removeLastHistoryElement() :SimulationElement
throws an EmptyStackException iff the underlying stack is empty but
one tries to retrieve/remove the last history element. In stark constrast
the java-doc comment says null will be returned in such a case. This is
*very* misleading.
