Add preliminary missing airline check

resources/js/Components/FlightsGoneBy/DepartureBoardTableRow.vue

@@ -160,7 +160,7 @@ const showColumn = (column: string) => props.columnsToShow.includes(column)
 
         <td v-if="showColumn('class_seat_combined')" class="v-data-table__td  class-badges-cell">
             <span class="class-cell">
-                <CrewTooltip v-if="flight.flight_reason?.name == 'Crew'" :crew-type="flight.crew_type!">
+                <CrewTooltip v-if="flight.flight_reason?.name == 'Crew' && flight.crew_type" :crew-type="flight.crew_type!">
                     <FlightClassBadge v-if="flight.flight_class?.internal_name === 'crew'" :flight="flight" />
                     <InlineBadge v-else variant="crew">Crew</InlineBadge>
                 </CrewTooltip>