(a) The proceeding described in this article being in rem, no provision in Code Sections 32-3-8 and 32-3-9 as to service shall be so construed as to invalidate the intent of the condemnor or as to delay the taking of the property or interest described in the declaration of taking and in the petition or in any manner as to delay the progress of the work for which the taking was made; and a substantial compliance with the provisions for service as heretofore set out in this article shall be deemed sufficient.

(b) At any stage of the cause before final verdict and judgment, the judge of the superior court may order such additional service to be made or such additional parties to be named as may be required by equity and justice; but this shall not be so construed as to invalidate the taking or delay the progress of the work.