Hide the celery command (and avoid breakage) if unavailable
Hide the celery command (and avoid breakage) if unavailable


Former-commit-id: c1102f8d716f95573a61356a02ea7d174e132378 [formerly 8753ab5b1ba65a2813853fb9d4ad1b2c0204b5c0] [formerly 8753ab5b1ba65a2813853fb9d4ad1b2c0204b5c0 [formerly 58ec434f97276347ec7b561bf4967344cf91341c]]
Former-commit-id: 68c523c3f2926cf2c8e59a5da03ca1b25a527741
Former-commit-id: 9147bfdc54b87a704b2b56e187de0690487b3165
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine