Index: trunk/src/org/openstreetmap/josm/gui/dialogs/relation/actions/AbstractRelationEditorAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/relation/actions/AbstractRelationEditorAction.java	(revision 13507)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/relation/actions/AbstractRelationEditorAction.java	(revision 13509)
@@ -55,4 +55,6 @@
 
     protected final boolean canDownload() {
+        if (editor.getRelation() == null)
+            return false;
         DataSet ds = editor.getRelation().getDataSet();
         return !Main.isOffline(OnlineResource.OSM_API)
Index: trunk/src/org/openstreetmap/josm/tools/I18n.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/I18n.java	(revision 13507)
+++ trunk/src/org/openstreetmap/josm/tools/I18n.java	(revision 13509)
@@ -10,5 +10,4 @@
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
-import java.nio.file.Files;
 import java.nio.file.InvalidPathException;
 import java.text.MessageFormat;