PG connection description readin

plugins/org.jkiss.dbeaver.ext.postgresql/src/org/jkiss/dbeaver/ext/postgresql/model/PostgreDatabase.java

@@ -255,8 +255,9 @@ public class PostgreDatabase extends JDBCRemoteInstance<PostgreDataSource>
         if (description != null) {
             return description;
         }
+
         // Query row count
-        try (JDBCSession session = DBUtils.openUtilSession(monitor, this, "Read database description")) {
+        try (JDBCSession session = DBUtils.openUtilSession(monitor, getDataSource(), "Read database description")) {
             description = JDBCUtils.queryString(session, "select description from pg_shdescription "
                     + "join pg_database on objoid = pg_database.oid where datname = ?", getName());
         } catch (SQLException e) {
@@ -316,7 +317,7 @@ public class PostgreDatabase extends JDBCRemoteInstance<PostgreDataSource>
         if (!getDataSource().getServerType().supportsRoles()) {
             return null;
         }
-
+        checkInstanceConnection(monitor);
         return PostgreUtils.getObjectById(monitor, roleCache, this, roleId);
     }
 
@@ -325,7 +326,7 @@ public class PostgreDatabase extends JDBCRemoteInstance<PostgreDataSource>
         if (!getDataSource().getServerType().supportsRoles()) {
             return null;
         }
-
+        checkInstanceConnection(monitor);
         return roleCache.getObject(monitor, owner, roleName);
     }