[(a) Except as otherwise provided in subsection (b), venue for a judicial proceeding involving a trust is in the [county] of this State in which the trust’s principal place of administration is or will be located and, if the trust is created by will and the estate is not yet closed, in the [county] in which the decedent’s estate is being administered.
(b) If a trust has no trustee, venue for a judicial proceeding for the appointment of a trustee is in a [county] of this State in which a beneficiary resides, in a [county] in which any trust property is located, and if the trust is created by will, in the [county] in which the decedent’s estate was or is being administered.]