Index: trunk/src/org/openstreetmap/josm/data/imagery/ImageryInfo.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/imagery/ImageryInfo.java	(revision 4436)
+++ trunk/src/org/openstreetmap/josm/data/imagery/ImageryInfo.java	(revision 4437)
@@ -119,4 +119,6 @@
         if(imageryType == ImageryType.WMS || imageryType == ImageryType.HTML) {
             res.add(pixelPerDegree != 0.0 ? String.valueOf(pixelPerDegree) : null);
+        } else {
+            res.add(null);
         }
         res.add(bounds != null ? bounds.encodeAsString(",") : null);