Description of problem:
-----------------------
The following routing error is seen in production.log:

RoutingError (No route matches [GET] "/assets/dhtmlx_gpl_36/imgs/dhxlayout_dhx_miq/dhxlayout_bg.png")

Snippet from production.log:
[----] I, [2015-10-26T12:46:26.198136 #2902:7d198c]  INFO -- : Started GET "/assets/dhtmlx_gpl_36/dhtmlxgrid-0ab493802cfc82f57440f9df1e3409c0f4c1f81fb01ddebd407032a8978e78c3.js?_=1445877949752" for 127.0.0.1 at 2015-10-26 12:46:26 -0400
[----] I, [2015-10-26T12:46:26.553746 #2902:7d198c]  INFO -- : Started GET "/assets/dhtmlx_gpl_36/dhtmlxgridcell-12acdf50e150375456e2c1f3db72a869cb7c6e1d96509681f762db85b4a4fff9.js?_=1445877949753" for 127.0.0.1 at 2015-10-26 12:46:26 -0400
[----] I, [2015-10-26T12:46:26.646893 #2902:7d198c]  INFO -- : Started GET "/assets/dhtmlx_gpl_36/ext/dhtmlxgrid_filter-ab53c9827d06f360dd63389580c8a9f12496cdb165671e97ff95887c7a62b8b6.js?_=1445877949754" for 127.0.0.1 at 2015-10-26 12:46:26 -0400
[----] I, [2015-10-26T12:46:26.729893 #2902:7d198c]  INFO -- : Started GET "/assets/dhtmlx_gpl_36/excells/dhtmlxgrid_excell_link-b8770e875e9185e93190e3ecd496adf2d230cb66af9cff68738328d134136918.js?_=1445877949755" for 127.0.0.1 at 2015-10-26 12:46:26 -0400
[----] I, [2015-10-26T12:46:26.802264 #2902:7d198c]  INFO -- : Started GET "/assets/miq_dhtmlxgrid-d7f8b03cd66050845874c47fcf203d073b77d97611217cacd17fd433d6d1c48f.js?_=1445877949756" for 127.0.0.1 at 2015-10-26 12:46:26 -0400
[----] I, [2015-10-26T12:46:26.948708 #2902:7d198c]  INFO -- : Started GET "/assets/dhtmlx_gpl_36/imgs/dhxlayout_dhx_miq/dhxlayout_bg.png" for 127.0.0.1 at 2015-10-26 12:46:26 -0400
[----] F, [2015-10-26T12:46:26.953891 #2902:7d198c] FATAL -- :
ActionController::RoutingError (No route matches [GET] "/assets/dhtmlx_gpl_36/imgs/dhxlayout_dhx_miq/dhxlayout_bg.png"):
  actionpack (4.2.4) lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.2.4) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.2.4) lib/rails/rack/logger.rb:22:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
  rack (1.6.4) lib/rack/runtime.rb:18:in `call'
  activesupport (4.2.4) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  rack (1.6.4) lib/rack/lock.rb:17:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/static.rb:116:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/static.rb:116:in `call'
  rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
  railties (4.2.4) lib/rails/engine.rb:518:in `call'
  railties (4.2.4) lib/rails/application.rb:165:in `call'
  rack (1.6.4) lib/rack/content_length.rb:15:in `call'
  thin (1.6.3) lib/thin/connection.rb:86:in `block in pre_process'
  thin (1.6.3) lib/thin/connection.rb:84:in `catch'
  thin (1.6.3) lib/thin/connection.rb:84:in `pre_process'
  thin (1.6.3) lib/thin/connection.rb:53:in `process'
  thin (1.6.3) lib/thin/connection.rb:39:in `receiveeventmachine (1.0.7)   lib/eventmachine.rb:187:in `run_machine'
  eventmachine (1.0.7) lib/eventmachine.rb:187:in `run'
  thin (1.6.3) lib/thin/backends/base.rb:73:in `start'
  thin (1.6.3) lib/thin/server.rb:162:in `start'
  rack (1.6.4) lib/rack/handler/thin.rb:19:in `run'
  rack (1.6.4) lib/rack/server.rb:286:in `start'
  railties (4.2.4) lib/rails/commands/server.rb:80:in `start'
  railties (4.2.4) lib/rails/commands/commands_tasks.rb:80:in `block in server'
  railties (4.2.4) lib/rails/commands/commands_tasks.rb:75:in `tap'
  railties (4.2.4) lib/rails/commands/commands_tasks.rb:75:in `server'
  railties (4.2.4) lib/rails/commands/commands_tasks.rb:39:in `run_command!'
  railties (4.2.4) lib/rails/commands.rb:17:in `<top (required)>'
  bin/rails:4:in `require'
  bin/rails:4:in `<main>_data'
  


Version-Release number of selected component (if applicable):
------------------------
5.5.0.7


How reproducible:
-----------------
Not sure


Steps to Reproduce:
------------------
1.
2.
3.

Actual results:
--------------
Routing error in production.log


Expected results:
----------------
No routing error


Additional info:
---------------