>   There is no check if the pointer returned by GetDataBase,GetActiveDAQ is valid. This can result 
> segmentation fault.
>   For instance, if one specifies DAQ system as "none", or one does not specify DataBaseName, rome 
> stops without error message.
> 
> It is better to modify this behavior.
> 
> 
> * One way is to stop application like.
> ROMEDAQSystem* GetActiveDAQ() {
>    if(!fActiveDAQ){
>       gAnalyzer->Println("some error message");
>       fApplication->Terminate(1);
>    }
>    return fActiveDAQ;
> };
> 
> *Other way is to use a dummy DAQSystem and DataBase which does nothing when user does not 
> specify DAQ or DataBase.  When dummy is used, warning message must be shown, because it is 
> dangerous that users do not realize they are using dummy.


done