Remove two spurious m_sceneGraph != null checks in Scene.cs.  It's set in constructor and never subsequent set to null.
Remove two spurious m_sceneGraph != null checks in Scene.cs.  It's set in constructor and never subsequent set to null.

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