Cope with airports with iata codes but no names.

See https://help.openstreetmap.org/questions/67177/error-loading-pbf-file
SomeoneElseOSM · Dec 14, 2018 · cf99c4e · cf99c4e
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diff --git a/changelog.md b/changelog.md
@@ -5,6 +5,7 @@ This page describes changes made [here](https://github.com/SomeoneElseOSM/Someon
 --->
 ## As yet unreleased
 Added icons for ambulance station, mountain rescue and mountain rescue box.
+Cope with airports with iata codes but no names.
 
 <!---
 On Hetzner only

diff --git a/style.lua b/style.lua
@@ -4387,7 +4387,12 @@ function filter_tags_generic(keyvalues, nokeys)
        ( keyvalues["aerodrome:type"] ~= "military"  ) and
        ( keyvalues["military"]       == nil         )) then
       keyvalues["aeroway"] = "large_aerodrome"
-      keyvalues["name"] = keyvalues["name"] .. " (" .. keyvalues["iata"] .. ")"
+
+      if ( keyvalues["name"] == nil ) then
+         keyvalues["name"] = keyvalues["iata"]
+      else
+         keyvalues["name"] = keyvalues["name"] .. " (" .. keyvalues["iata"] .. ")"
+      end
    end
 
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