Fix bug that upload multiple files failed.

app/controllers/admin/galleries_controller.rb

@@ -498,7 +498,7 @@ class Admin::GalleriesController < OrbitAdminController
 
 
   def upload_process
-    if AlbumUnprocess.first.upload_success
+    if (AlbumUnprocess.first.upload_success rescue false)
       album_unprocess = Array(AlbumUnprocess.all)
       count = album_unprocess.count
       Thread.new do
@@ -563,6 +563,7 @@ class Admin::GalleriesController < OrbitAdminController
           album_unprocess.save_var = file
           album_unprocess.save!
           ObjectSpace.undefine_finalizer(file.tempfile)
+          request.set_header(Rack::RACK_TEMPFILES, []) # Avoid Rack::TempfileReaper Middleware to unlink temp files automatically.
         end
         image.save!
     end
@@ -572,7 +573,7 @@ class Admin::GalleriesController < OrbitAdminController
   def last_image_id
     album = Album.find(params[:albumid])
     lastimage = album.album_images.last
-    render :json => {"last_image_id" => lastimage.id.to_s}.to_json
+    render :json => {"last_image_id" => (lastimage ? lastimage.id.to_s : nil)}.to_json
   end
 
   def new_images