Added check for number of objects after merging
Previously, the pipeline would crash when the merging step resulted in an empty source list. A check has now been added to gracefully exit the pipeline when no detections are left after the merging step.
Correction of help on output directory
The default output directory was changed from working directory to input cube directory to reflect what is actually happening.
Added mean flux within W_m50
The mean flux density with the boundaries of the W_m50 line width parameter is now added to the output source catalogue.