Remove NBTTagEnd, it isn't possible to create it

src/forge/java/com/sk89q/worldedit/forge/NBTConverter.java

@@ -40,9 +40,6 @@ final class NBTConverter {
         } else if (tag instanceof ListTag) {
             return toNative((ListTag) tag);
 
-        } else if (tag instanceof EndTag) {
-            return toNative((EndTag) tag);
-
         } else if (tag instanceof LongTag) {
             return toNative((LongTag) tag);
 
@@ -90,10 +87,6 @@ final class NBTConverter {
         return list;
     }
 
-    public static NBTTagEnd toNative(EndTag tag) {
-        return new NBTTagEnd();
-    }
-
     public static NBTTagLong toNative(LongTag tag) {
         return new NBTTagLong(tag.getValue());
     }