add parsing error status for missing imports

[syphax-bouazzouni]

For the problem of missing imports, the suggestion is to create a complementary/additional error status that will be triggered when the missing import is detected during parsing and that will explicitly inform the admin user of the problem.

In addition, we have yet attribute for missing imports that we can find here : http://data.agroportal.lirmm.fr/ontologies/AFEO/latest_submission?display=missingImports

[jonquet]

Considering the metadata property (in the original BioPortal model) "missingImports" an alternative to create a new parsing status is just to use this property to inform the user of the missing imports and display something in the UI.

For example: http://data.agroportal.lirmm.fr/ontologies/AFEO/latest_submission?display=missingImports

In the UI, a possibility is to display this line with 2 columns:

The second column would be used to display a sentence "This import was not resolved" in italic or coloured (e.g. jaune)