Fix loading of existing gate icon.

src/de/craftinc/gates/dynmap/Plugin.java

@@ -93,6 +93,9 @@ public class Plugin extends JavaPlugin
 
     private void loadIcons()
     {
+        this.gateIcon = this.markerAPI.getMarkerIcon(markerSetID);
+
+        if (this.gateIcon == null) {
             InputStream inputStream = this.getClass().getResourceAsStream("/gate.png");
 
             if (inputStream == null) {
@@ -106,6 +109,7 @@ public class Plugin extends JavaPlugin
                 log(Level.SEVERE, "Cannot load gate icon");
             }
         }
+    }
 
 
 
@@ -124,6 +128,11 @@ public class Plugin extends JavaPlugin
         List<Gate> allGates = this.gatesPlugin.getGatesManager().allGates();
 
         for (Gate g : allGates) {
+
+            if (g.getLocation() == null) {
+                continue;
+            }
+
             String id = g.getId();
             String label = g.getId();
             boolean markup = false;