Index: /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/Selector.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/Selector.java	(revision 17803)
+++ /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/Selector.java	(revision 17804)
@@ -845,5 +845,5 @@
             return base
                     + (Range.ZERO_TO_INFINITY.equals(range) ? "" : range)
-                    + (getConditions().stream().map(String::valueOf).collect(Collectors.joining("")))
+                    + getConditions().stream().map(String::valueOf).collect(Collectors.joining(""))
                     + (subpart != null && subpart != Subpart.DEFAULT_SUBPART ? ("::" + subpart) : "");
         }