Respond with data on gardens#edit, so non-html formats don't break specs

app/controllers/gardens_controller.rb

@@ -33,7 +33,9 @@ class GardensController < ApplicationController
   end
 
   # GET /gardens/1/edit
-  def edit; end
+  def edit
+    respond_with(@garden)
+  end
 
   # POST /gardens
   # POST /gardens.json