fix error

app/models/bulletin_feed.rb

@@ -36,14 +36,13 @@ class BulletinFeed
       else
         Timeout::timeout(timeout) do
           feed_cache = nil
-          Thread.new do
+          thread = Thread.new do
             feed_cache = self.generate_one_cache(startdt: startdt,enddt: enddt,dt: dt,base_url: base_url)
           end
           (1..(timeout.to_i+1)).each do
             sleep(1)
-            break if !feed_cache.nil?
+            break if !feed_cache.nil? && !thread.alive?
           end
-          sleep(0.5)
           feed_cache.content
         end
       end