Error when Dialog does not have a actions prop

[willdurand]

According to the prop types definition, it should be possible to have a dialog without actions, but this causes an error because the Dialog tries to iterate over the actions (.map()). It should be possible to use a Dialog without actions.

[mikbry]

You should have actions or Buttons as children or nothing right. I don't see when this error occur. In DialogFooter it iterate over an empty "a" variable.