ERROR exit needed in ATI for missing DataReader

[mashephe]

Around line 194 in the AmpToolsInterface the package will print a warning if the data reader is missing. This could be the case for example, if a user specifies a data reader that is not registered. A warning is not severe enough as the program continues to run. Here there should be an error and exit -- or elsewhere we should catch the error if a user specifies an unregistered data reader and exit.

      if (!dataRdr)
        report( WARNING, kModule ) << "not creating a DataReader for data associated with reaction " << reactionName << endl;
      if (!genMCRdr)
        report( WARNING, kModule ) << "not creating a DataReader for generated MC associated with reaction " << reactionName << endl;
      if (!accMCRdr)
        report( WARNING, kModule ) << "not creating a DataReader for accepted MC associated with reaction " << reactionName << endl;