Fix Svace issue
Fix Svace issue

- Return value of a function GetMap() has to be checked for NULL at shader-impl.cpp

Change-Id: Ib28207bcb87b073eea34887233514c31958c11f1

dalihub/dali-core,dalihub/dali-core,pwisbey/dali-core,pwisbey/dali-core,pwisbey/dali-core,pwisbey/dali-core,dalihub/dali-core,dalihub/dali-core