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In other words, print more user-friendly messages, and avoid crashing. Specifically: * Don't crash when attempting to load schema tables from configured data-dir, while configuration does not have any configured data-directories. * Detect the case where schema mutations have no rows for the current table -- the keyspace exists, but the table doesn't. * Add negative tests for schema-loading. Fixes: https://github.com/scylladb/scylladb/issues/16459 Closes scylladb/scylladb#16494 * github.com:scylladb/scylladb: test/cql-pytest: test_tools.py: add test for failed schema loadig tools/scylla-sstable: use at() instead of operator [] when obtaining data dirs tools/schema_loader: also check for empty table/column mutations tools/schema_loader: log more details when loading schema from schema tables