minor: Make the error thrown logged when a simulator in grid mode is trying to set estate owner to a user that doesn't exist a little more obvious.
minor: Make the error thrown logged when a simulator in grid mode is trying to set estate owner to a user that doesn't exist a little more obvious.

EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,RavenB/opensim,RavenB/opensim,rryk/omp-server,RavenB/opensim,Michelle-Argus/ArribasimExtract,QuillLittlefeather/opensim-1,ft-/arribasim-dev-tests,ft-/arribasim-dev-extras,ft-/opensim-optimizations-wip-extras,ft-/opensim-optimizations-wip-extras,QuillLittlefeather/opensim-1,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,ft-/opensim-optimizations-wip-extras,bravelittlescientist/opensim-performance,rryk/omp-server,Michelle-Argus/ArribasimExtract,ft-/arribasim-dev-extras,rryk/omp-server,ft-/opensim-optimizations-wip-extras,rryk/omp-server,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,M-O-S-E-S/opensim,OpenSimian/opensimulator,OpenSimian/opensimulator,ft-/arribasim-dev-tests,ft-/arribasim-dev-extras,justinccdev/opensim,ft-/arribasim-dev-tests,BogusCurry/arribasim-dev,M-O-S-E-S/opensim,ft-/opensim-optimizations-wip-tests,bravelittlescientist/opensim-performance,TomDataworks/opensim,OpenSimian/opensimulator,bravelittlescientist/opensim-performance,ft-/arribasim-dev-extras,TomDataworks/opensim,QuillLittlefeather/opensim-1,QuillLittlefeather/opensim-1,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,ft-/arribasim-dev-tests,QuillLittlefeather/opensim-1,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,RavenB/opensim,ft-/opensim-optimizations-wip-extras,justinccdev/opensim,BogusCurry/arribasim-dev,TomDataworks/opensim,M-O-S-E-S/opensim,Michelle-Argus/ArribasimExtract,M-O-S-E-S/opensim,QuillLittlefeather/opensim-1,M-O-S-E-S/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,OpenSimian/opensimulator,BogusCurry/arribasim-dev,ft-/opensim-optimizations-wip,ft-/opensim-optimizations-wip,ft-/opensim-optimizations-wip-tests,justinccdev/opensim,BogusCurry/arribasim-dev,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,RavenB/opensim,rryk/omp-server,OpenSimian/opensimulator,ft-/arribasim-dev-tests,TomDataworks/opensim,ft-/opensim-optimizations-wip-tests,RavenB/opensim,ft-/arribasim-dev-extras,ft-/arribasim-dev-extras,Michelle-Argus/ArribasimExtract,TomDataworks/opensim,bravelittlescientist/opensim-performance,QuillLittlefeather/opensim-1,justinccdev/opensim,TomDataworks/opensim,bravelittlescientist/opensim-performance,justinccdev/opensim,OpenSimian/opensimulator,ft-/opensim-optimizations-wip,OpenSimian/opensimulator,rryk/omp-server,Michelle-Argus/ArribasimExtract,ft-/opensim-optimizations-wip-tests,ft-/opensim-optimizations-wip-tests,justinccdev/opensim,ft-/opensim-optimizations-wip,bravelittlescientist/opensim-performance,TomDataworks/opensim,BogusCurry/arribasim-dev,Michelle-Argus/ArribasimExtract,RavenB/opensim,M-O-S-E-S/opensim,M-O-S-E-S/opensim,ft-/arribasim-dev-tests,BogusCurry/arribasim-dev