Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/OsmTileSource.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/OsmTileSource.java	(revision 25326)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/OsmTileSource.java	(revision 25336)
@@ -27,4 +27,7 @@
             BASE_URL = base_url;
             ATTR_IMG_URL = attr_img_url;
+            if(ATTR_IMG_URL == null) {
+                 REQUIRES_ATTRIBUTION = false;
+            }
         }