[core/cont] check nullptr in memcpy in TRefArray class #7424
[core/cont] check nullptr in memcpy in TRefArray class #7424

Fix similar code as in TArray classes
Mark several operations as false-positive (//NOMIT)

olifre/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,olifre/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,olifre/root