Add extra properties to NTSB feed

jq/ntsb.jq

@@ -616,6 +616,8 @@ def to_ul: if length > 0 then "<ul><li>\(map(values)|join("</li><li>"))</li></ul
                         "Flag state": .flagState,
                         "Traffic unit name": .trafficUnitName,
                         "Traffic unit type": .trafficUnitType,
+                        "Serial number": .SerialNumber,
+                        "Damage level": .DamageLevel,
                         "Carrying hazardous materials": .carryingHazmat,
                         "Has released hazardous materials": .releasedHazmat,
                         "Units": ([
@@ -635,8 +637,8 @@ def to_ul: if length > 0 then "<ul><li>\(map(values)|join("</li><li>"))</li></ul
                             (.cm_events // [])[] | (
                                 (
                                     # Try to use the known event codes to map to more specific names
-                                    $event_codes[.cm_tier2Num]
-                                    // $event_codes[.cm_tier1Num]
+                                    (try $event_codes[.cm_tier2Num] catch null)
+                                    // (try $event_codes[.cm_tier1Num] catch null)
                                     # Fallback to the sometimes provided generic event group name
                                     // .cicttEventSOEGroup
                                     # Fallback to an error message