vlkb-obscore: turns off t_exptime calc (results nan for some surveys)

data-access/engine/src/vlkb-obscore/src/database/SqlSchema_INSERT.cpp

@@ -404,7 +404,7 @@ void SqlSchema_INSERT::appendRow(/*const int hid, const int sid,*/
 
    obscoreRow[t_min]        = time.t_min_str; //to_string(time.t_min);
    obscoreRow[t_max]        = time.t_max_str; //to_string(time.t_max);
-   obscoreRow[t_exptime]    = to_string(time.t_exptime);
+   obscoreRow[t_exptime]    = "NULL";// FIXME MALT gives 'nan' to_string(time.t_exptime);
    obscoreRow[t_resolution] = to_string(time.t_resolution);
    obscoreRow[t_xel]        = to_string(time.t_xel);