nvh265sldec: Sync up with d3d11h265dec implementation
Each RefPicSetStCurrBefore/RefPicSetStCurrAfter/RefPicSetLtCurr array might have empty element (i.e., reference pictures might not be stored sequentially). Don't error out for the empty element case, and instead, but instead, iterates each array and fill NVDEC's reference list as much as possible
Fixes: #1441 (closed)
Edited by Seungha Yang