Don't allow users to select data sources when there is no data layer

This fixes #91.

Signed-off-by: Taylor Smock <taylor.smock@kaart.com>

src/main/java/org/openstreetmap/josm/plugins/mapwithai/actions/AddMapWithAILayerAction.java

@@ -116,8 +116,9 @@ public class AddMapWithAILayerAction extends JosmAction implements AdaptableActi
 
     @Override
     protected void updateEnabledState() {
-        setEnabled(!info.isBlacklisted() && (MapWithAIDataUtils.getLayer(false) == null
-                || !MapWithAIDataUtils.getLayer(false).hasDownloaded(info)));
+        setEnabled(!info.isBlacklisted() && MainApplication.getLayerManager().getActiveDataLayer() != null
+                && (MapWithAIDataUtils.getLayer(false) == null
+                        || !MapWithAIDataUtils.getLayer(false).hasDownloaded(info)));
     }
 
     @Override

src/main/java/org/openstreetmap/josm/plugins/mapwithai/gui/MapWithAIMenu.java

@@ -133,7 +133,7 @@ public class MapWithAIMenu extends JMenu {
         if (MainApplication.isDisplayingMapView()) {
             MapView mv = MainApplication.getMap().mapView;
             LatLon pos = mv.getProjection().eastNorth2latlon(mv.getCenter());
-            final List<MapWithAIInfo> inViewLayers = MapWithAILayerInfo.getInstance().getDefaultLayers().stream()
+            final List<MapWithAIInfo> inViewLayers = MapWithAILayerInfo.getInstance().getAllDefaultLayers().stream()
                     .filter(i -> i.getBounds() != null && i.getBounds().contains(pos) && !alreadyInUse.contains(i)
                             && !savedLayers.contains(i) && isPosInOneShapeIfAny(i, pos))
                     .sorted(alphabeticSourceComparator).collect(Collectors.toList());
@@ -162,7 +162,7 @@ public class MapWithAIMenu extends JMenu {
                     }
                 }
             }
-            if (dynamicNonPhotoItems.isEmpty()) {
+            if (dynJosmActions.isEmpty()) {
                 JosmAction infoAction = new JosmAction() {
                     @Override
                     public void actionPerformed(ActionEvent e) {