Dereference before null check

There may be a null pointer dereference, or else the comparison against null is unnecessary. All paths that lead to this null pointer comparison already dereference the pointer earlier
/src/mongo/db/s/global_index/global_index_cloner_fetcher.cpp:159: REVERSE_INULL 128580 Directly dereferencing pointer "this->_pipeline".
/src/mongo/db/s/global_index/global_index_cloner_fetcher.cpp:167: REVERSE_INULL 128580 Null-checking "this->_pipeline" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.