Dereference null return value

If the function actually returns a null value, a null pointer dereference will occur. Return value of function which returns null is dereferenced without checking
/src/mongo/db/shard_role/shard_catalog/coll_mod_index.cpp:365: NULL_RETURNS 183913 Assigning: "entry" = "nullptr" return value from "findIndexByName".
/src/mongo/db/shard_role/shard_catalog/coll_mod_index.cpp:366: NULL_RETURNS 183913 Passing null pointer "entry" to "accessMethod", which dereferences it. (The dereference happens because this is a virtual function call.)