NoMethodError: undefined method `single_class' for nil:NilClass

[sentry-io]

Sentry Issue: AGROPORTAL-UI-6S

NoMethodError: undefined method `single_class' for nil:NilClass

    @concept = @ontology.explore.single_class({ full: true }, params[:conceptid])
                                ^^^^^^^^^^^^^
  app/controllers/mappings_controller.rb:159:in `get_concept_table'
    @concept = @ontology.explore.single_class({ full: true }, params[:conceptid])
...
(92 additional frame(s) were not displayed)

This issue was automatically created by Sentry via UI issues

[imadbourouche]

the issue because we are not handling the nil values in the get_concept_table method

  def get_concept_table
    @ontology = LinkedData::Client::Models::Ontology.find_by_acronym(params[:ontologyid]).first
    @concept = @ontology.explore.single_class({ full: true }, params[:conceptid])

    @mappings = @concept.explore.mappings
    @type = params[:type]
    @delete_mapping_permission = check_delete_mapping_permission(@mappings)
    render partial: 'mappings/concept_mappings', layout: false
  end