author 'not applicable' (for CLARIN)

[hwidmann]

See e.g. http://eudat-b1.dkrz.de/dataset/15f19c05-f67f-53d6-ad38-008cc4359885

Should we fix this again with
[not(text()='not applicable')] ?
But I think author should be a mandatory field, or ?
And maybe mapped to a unique value 'N/A' (or let 'not applicable' ??)

[hwidmann]

For the above dataset this issue is solved, likely by improved xpath mapping.
Inprinciple the general issue 'Mandatory field not found' will be solved in the planned post-processsing step of the mapper, see
https://confluence.csc.fi/display/Eudat/Post-Mapper+Processing