There is no hard and fast answer to what happens to a revocable trust when a grantor dies. Most of them become irrevocable. However, the only way to know what this one does is to read the document.
If the deceased transferred all of his property to the trust prior to death or at the time of death only owned property subject to survivorship provisions outside the trust, it is possible there would be no probate estate. There may, however, be an estate for tax purposes.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.