Fix segfault in rmanRenderer when light shader missing.
Fix segfault in rmanRenderer when light shader missing.

Dependent Libraries:
  libut      : ec27dd0b4ca09aee979ce8445413e0b871ff162a
  liblog     : d987851d25db9d746ed36b4464b6b179cbfb3582
  librp      : a4c13ffb6e3da949adba54a2a81294004e288172
  libil      : c67c66207ea481bae4fad1f297dd3f226f145b7d
  libsg      : 62e23f58097118ad94b8aadd83525987347afd45

etiam/ov,etiam/ov,etiam/ov,etiam/ov,etiam/ov