Exoplanets, Protoplanets, and planetesimals
Whether or not gas giants form is largely to do with whether rocky/icy cores are able to accrete large quantities of hydrogen and helium, which dominate the mass of the protostellar disc. 

Terrestrial planets form from the tiny fraction of the disc that is able to form solids.

There is no indication that systems without gas giants have more "solids" and most of the raw material in the disc is either accreted onto the star or expelled from the system in either case.