SL-16907 Crash at updateSkinInfoMatrixPalette

When animesh stops being an animesh it might still be in a list, but will no longer have an avatar

indra/newview/lldrawpool.cpp

@@ -451,7 +451,7 @@ void LLRenderPass::pushRiggedBatches(U32 type, U32 mask, BOOL texture, BOOL batc
         LLDrawInfo* pparams = *i;
         if (pparams)
         {
-            if (lastAvatar != pparams->mAvatar || lastMeshId != pparams->mSkinInfo->mHash)
+            if (pparams->mAvatar.notNull() && (lastAvatar != pparams->mAvatar || lastMeshId != pparams->mSkinInfo->mHash))
             {
                 uploadMatrixPalette(*pparams);
                 lastAvatar = pparams->mAvatar;