Missing empty lambda check in LambdaCallback::modalStateFinished()

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Could you test for an empty lambda in LambdaCallback::modalStateFinished() ? (in Juce_ModalComponentManager.cpp, line 284)

void modalStateFinished (int result) override { if (function != nullptr) function (result); }

Otherwise a code like that will crash :

popupMenu.showMenuAsync (PopupMenu::Options(), function);
when called with an empty std::function<void(int)> function;
(when the user clicks a menu item)

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