It would be nice to add a check for the input dataframe (me_df) to not be empty, and if empty print a warning.

[gbenelli]

I would add the check as the first line of the generate_me_df function

DQMExplore/src/dqmexplore/dataproc.py

Line 8 in 6ee04b8

mes = list(me_df["me"].unique())

[roy-cruz]

The new MEData class has this function as one of its methods, so this issue is still relevant. I added an if statement which checks if len(me_df) == 0 and if its True, it prints out a warning. You can find it in the latest commit in the PR.