With AERONET data there some stations that do not have any data for a given variable and year (there are other variables but not this one). Now I have an automatic script which collocates model data to AERONET. With earlier versions (at least 1.4) collocating to empty data would result in empty collocated data as well. But with v1.7.1 I am getting values for collocated data even when AERONET has no data. Of course I can do a work around, but I feel this is a reduction in usability.