removed unuseful NULLs
removed unuseful NULLs


Former-commit-id: 95ee959256938c25b0df53dfe0beeb5221aa8b32 [formerly 95ee959256938c25b0df53dfe0beeb5221aa8b32 [formerly 36f7798643de8a31a0a524e433bf26d9ed3698f9]]
Former-commit-id: 7a80f9318c4654c93151dd5a3d7fc5755823fd22
Former-commit-id: fd328eac989bfb189050572e4ca45f01576f9524
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine