Revert "remove useless debug message"

This reverts commit dea609140b.

src/sqlitedb.cpp

@@ -642,6 +642,7 @@ void DBBrowserDB::updateSchema( )
     }else{
         qDebug ("could not get list of tables: %d, %s",err,sqlite3_errmsg(_db));
     }
+    qDebug(sqlite3_errmsg(_db));
 
     //now get the field list for each table in tbmap
     tableMap::Iterator it;