.investigation_other_data
  - unless investigation.domain.name.nil?
    .data_header Scientific Domain
    .data_value 
      = investigation.domain.name
  - unless investigation.grade_span.nil?
    .data_header Grade
    .data_value 
      = investigation.grade_span
  - required_equipments = probe_types(investigation).map { |p| p.name }.join(", ") 
  - unless required_equipments == ""
    .data_header Required sensor(s)
    .data_value 
      = required_equipments
.investigation_other_data
  - unless investigation.grade_span_expectation.nil?
    .data_header Scientific Domain
    .data_value 
      = investigation.domain.name
    .data_header Grade
    .data_value 
      = investigation.grade_span
  - required_equipments = probe_types(investigation).map { |p| p.name }.join(", ") 
  - unless required_equipments == ""
    .data_header Required sensor(s)
    .data_value 
      = required_equipments
Handle nil case for investigation data
Handle nil case for investigation data

- Handle nil grade_span_expectation case for investigation data
