mpg-age-bioinformatics/flaski

[BUG] DAVID check for df

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App
DAVID

Describe the bug
if there is no session["david_df"] an error occurs.

 File "/flaski/flaski/apps/routes/david.py", line 156, in david
   david_df=pd.read_json(session["david_df"])

Expected behavior
Inform user that the table is missing. Ie. there are currently no results.

solved along #126 as the option that leads to this will not be available any longer