catch empty observations after NaN filtering
Thibault Hallouin authored
when observations only contain NaNs, the resulting data subset is
empty, which makes the quantile calculation fail

this can happen when evalhyd is used on a period with no observations
(which may rest on the user responsibility), but this can also happen
when subperiods (i.e. via temporal masking) have no observations even
if there are observations in the overall period (which is less easy
for the user to anticipate)
0ca9b41a
Name Last commit Last update