Fix error when image type not support by minimagick.

app/controllers/page_contents_controller.rb

@@ -46,6 +46,7 @@ class PageContentsController < OrbitAdminController
             image_file = Tempfile.new
             image_file.binmode
             image_file.write(res.body)
+            begin
               image = MiniMagick::Image.open(image_file.path)
               IMG_INFO[img_src] = {width: image[:width], height: image[:height]}
               if image[:width]
@@ -56,6 +57,9 @@ class PageContentsController < OrbitAdminController
               end
               image_file.close
               image_file.unlink
+            rescue MiniMagick::Invalid => e
+              puts ["src = #{img_src}", e.to_s]
+            end
           else
             IMG_INFO[img_src] = {}
           end