Fix img src not decode.

app/controllers/page_contents_controller.rb

@@ -28,6 +28,8 @@ class PageContentsController < OrbitAdminController
       metas << {"property" => "og:image", "content" => URI.join(request.base_url, URI.encode(img_src)).to_s}
       if img_src.start_with?('/')
         img_src_path = File.join('public', img_src)
+        img_src_path = URI.decode(img_src_path)
+        if File.exist?(img_src_path)
           image = MiniMagick::Image.open(img_src_path)
           if image[:width]
             metas << {"property" => "og:image:width", "content" => image[:width].to_s}
@@ -35,6 +37,7 @@ class PageContentsController < OrbitAdminController
           if image[:height]
             metas << {"property" => "og:image:height", "content" => image[:height].to_s}
           end
+        end
       else
         res = get_response(URI.parse(img_src))
         image = IMG_INFO[img_src]