add admin user depart records

app/models/product.rb

@@ -57,7 +57,11 @@ class Product < ActiveRecord::Base
                 end
             end
         end
-        return SIZE_ENUM
+        if SIZE_ENUM.length ==0
+            return []
+        else
+            return SIZE_ENUM
+        end
     end
 
     def get_color_enum
@@ -72,7 +76,11 @@ class Product < ActiveRecord::Base
                 end
             end
         end
-        return COLOR_ENUM
+        if COLOR_ENUM.length ==0
+            return []
+        else
+            return COLOR_ENUM
+        end
     end
     IMG_STORE_PATH = "product"