As a result from the finding in solving #210 I propose to change this:
If you create a subselection from an ObsCollection which does not have the 'obs' column, a DataFrame should be returned (instead of an invalid ObsCollection = an ObsCollection without the 'obs' column)
As a result from the finding in solving #210 I propose to change this:
If you create a subselection from an ObsCollection which does not have the 'obs' column, a DataFrame should be returned (instead of an invalid ObsCollection = an ObsCollection without the 'obs' column)