Index: trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSRuleIndex.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSRuleIndex.java	(revision 16820)
+++ trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSRuleIndex.java	(revision 16821)
@@ -118,6 +118,5 @@
 
         public BitSet get(String value) {
-            BitSet forValue = specialRules.get(value);
-            if (forValue != null) return forValue; else return generalRules;
+            return specialRules.getOrDefault(value, generalRules);
         }
     }