Error when no spots detected

## Bug report ## Description of the problem When no spots are detected, Takashi says that the pipeline throws an error. He had to create empty result files to handle this special case: »»»»»»»»echo "0.0,0.0,0.0,0.0" > $newfile »»»»»»»»echo "x,y,z,t,c,intensity" > $newfile_rs »»»»»»»»echo "0.0,0.0,0.0,1,1,0.0" >> $newfile_rs ## Log file(s) I don't have the log, but we should be able to reproduce this easily by feeding it an empty image.