Better error message if the site_id is wrong in the sites.csv file [skip hazardlib][demos]
Better error message if the site_id is wrong in the sites.csv file [skip hazardlib][demos]


Former-commit-id: ec87373a2f33a94ddf7adb1061ddc41866040d99
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine