Assume a failure in schema version check means it's not loaded.

If the schema version check fails in the prepare statement phase, that
probably means that the schema's not loaded (the riker table is
missing).
Try to load the schema - if something's really wrong, it'll fail again
later.

References: gh-10

gdastore/store.vala

@@ -123,8 +123,16 @@ public class Store: Object {
 			var stmt = builder.get_statement();
 			data = connection.statement_execute_select(stmt, null);
 		} catch (Error error) {
-			stderr.printf("%s %d %s\n", error.domain.to_string(), error.code, error.message);
-			throw new StoreError.OPEN_FAILED("Failed to check schema version: " + error.message);
+			if (error.domain == Gda.ServerProvider.error_quark() &&
+				error.code == Gda.ServerProviderError.PREPARE_STMT_ERROR) {
+				/*
+				 * This error probably means that the schema's
+				 * not loaded. So try to load it here.
+				 */
+				initialize_schema();
+			} else {
+				throw new StoreError.OPEN_FAILED("Failed to check schema version: " + error.message);
+			}
 		}
 	}