Better error message if the shared_dir is not mounted [skip hazardlib]
Better error message if the shared_dir is not mounted [skip hazardlib]


Former-commit-id: a5b2a927cf739c98beacc7b8c6367ce43b0b12db [formerly a5b2a927cf739c98beacc7b8c6367ce43b0b12db [formerly e892c485b85493f3c027372bb16fb69ff09d8de1]]
Former-commit-id: bc7275554b3ee6568dfb07e3df5583494ee888c8
Former-commit-id: b9d2ecd302542a16c0aa10cdcf38364b3adfd4d2
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine