Description of problem:
----------------------
This error was logged in production.log.
ActionController::RoutingError (No route matches [GET] "/favicon.ico")

Snippet from production.log:
[----] I, [2016-11-22T10:58:02.242605 #3027:150796c]  INFO -- : Started GET "/favicon.ico" for 127.0.0.1 at 2016-11-22 10:58:02 -0500
[----] F, [2016-11-22T10:58:02.247824 #3027:150796c] FATAL -- :
[----] F, [2016-11-22T10:58:02.247968 #3027:150796c] FATAL -- : ActionController::RoutingError (No route matches [GET] "/favicon.ico"):
[----] F, [2016-11-22T10:58:02.248026 #3027:150796c] FATAL -- :
[----] F, [2016-11-22T10:58:02.248088 #3027:150796c] FATAL -- : actionpack (5.0.0.1) lib/action_dispatch/middleware/debug_exceptions.rb:53:in `call'
[----] F, [2016-11-22T10:58:02.248146 #3027:150796c] FATAL -- : actionpack (5.0.0.1) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
[----] F, [2016-11-22T10:58:02.248212 #3027:150796c] FATAL -- : railties (5.0.0.1) lib/rails/rack/logger.rb:36:in `call_app'
[----] F, [2016-11-22T10:58:02.248257 #3027:150796c] FATAL -- : railties (5.0.0.1) lib/rails/rack/logger.rb:26:in `call'
[----] F, [2016-11-22T10:58:02.248315 #3027:150796c] FATAL -- : request_store (1.3.1) lib/request_store/middleware.rb:9:in `call'
[----] F, [2016-11-22T10:58:02.248360 #3027:150796c] FATAL -- : actionpack (5.0.0.1) lib/action_dispatch/middleware/request_id.rb:24:in `call'
[----] F, [2016-11-22T10:58:02.248397 #3027:150796c] FATAL -- : rack (2.0.1) lib/rack/method_override.rb:22:in `call'
[----] F, [2016-11-22T10:58:02.248432 #3027:150796c] FATAL -- : rack (2.0.1) lib/rack/runtime.rb:22:in `call'
[----] F, [2016-11-22T10:58:02.248492 #3027:150796c] FATAL -- : activesupport (5.0.0.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
[----] F, [2016-11-22T10:58:02.248536 #3027:150796c] FATAL -- : actionpack (5.0.0.1) lib/action_dispatch/middleware/executor.rb:12:in `call'
[----] F, [2016-11-22T10:58:02.248572 #3027:150796c] FATAL -- : rack (2.0.1) lib/rack/sendfile.rb:111:in `call'
[----] F, [2016-11-22T10:58:02.248607 #3027:150796c] FATAL -- : railties (5.0.0.1) lib/rails/engine.rb:522:in `call'
[----] F, [2016-11-22T10:58:02.248642 #3027:150796c] FATAL -- : puma (3.3.0) lib/puma/configuration.rb:224:in `call'
[----] F, [2016-11-22T10:58:02.248676 #3027:150796c] FATAL -- : puma (3.3.0) lib/puma/server.rb:561:in `handle_request'
[----] F, [2016-11-22T10:58:02.248734 #3027:150796c] FATAL -- : puma (3.3.0) lib/puma/server.rb:406:in `process_client'
[----] F, [2016-11-22T10:58:02.248778 #3027:150796c] FATAL -- : puma (3.3.0) lib/puma/server.rb:271:in `block in run'
[----] F, [2016-11-22T10:58:02.248812 #3027:150796c] FATAL -- : puma (3.3.0) lib/puma/thread_pool.rb:111:in `block in spawn_thread'
[----] I, [2016-11-22T11:12:46.426419 #3027:1506fbc]  INFO -- : Started GET "/" for 127.0.0.1 at 2016-11-22 11:12:46 -0500
[----] I, [2016-11-22T11:12:46.442280 #3027:1506fbc]  INFO -- : Processing by DashboardController#login as HTML
[----] I, [2016-11-22T11:12:46.458225 #3027:1506fbc]  INFO -- :   Rendering dashboard/login.html.haml within layouts/login
[----] I, [2016-11-22T11:12:46.459988 #3027:1506fbc]  INFO -- :   Rendered layouts/_spinner.html.haml (0.9ms)
[----] I, [2016-11-22T11:12:46.460495 #3027:1506fbc]  INFO -- :   Rendered layouts/_flash_msg.html.haml (0.1ms)
[----] I, [2016-11-22T11:12:46.461409 #3027:1506fbc]  INFO -- :   Rendered dashboard/_login_more.html.haml (0.1ms)
[----] I, [2016-11-22T11:12:46.467424 #3027:1506fbc]  INFO -- :   Rendered dashboard/login.html.haml within layouts/login (9.0ms)
[----] I, [2016-11-22T11:12:46.467865 #3027:1506fbc]  INFO -- :   Rendered layouts/_doctype.html.haml (0.1ms)
[----] I, [2016-11-22T11:12:46.469718 #3027:1506fbc]  INFO -- :   Rendered layouts/_i18n_js.html.haml (0.1ms)
[----] I, [2016-11-22T11:12:46.472211 #3027:1506fbc]  INFO -- : Completed 200 OK in 30ms (Views: 13.7ms | ActiveRecord: 0.0ms)
[----] I, [2016-11-22T11:12:52.675908 #3051:14f1e78]  INFO -- : Started GET "/api/auth?requester_type=ui" for 127.0.0.1 at 2016-11-22 11:12:52 -0500
[----] I, [2016-11-22T11:12:55.186193 #3051:14f1e78]  INFO -- : Processing by Api::AuthController#show as JSON
[----] I, [2016-11-22T11:12:55.186311 #3051:14f1e78]  INFO -- :   Parameters: {"requester_type"=>"ui"}
[----] I, [2016-11-22T11:12:55.587520 #3051:14f1e78]  INFO -- : Completed 200 OK in 401ms (Views: 1.0ms | ActiveRecord: 0.0ms)
[----] I, [2016-11-22T11:12:55.642318 #3051:14f1e78]  INFO -- : Started GET "/api/auth?requester_type=ws" for 127.0.0.1 at 2016-11-22 11:12:55 -0500
[----] I, [2016-11-22T11:12:55.644617 #3051:14f1e78]  INFO -- : Processing by Api::AuthController#show as JSON
[----] I, [2016-11-22T11:12:55.644696 #3051:14f1e78]  INFO -- :   Parameters: {"requester_type"=>"ws"}
/RoutingError


Version-Release number of selected component (if applicable):
-------------------------------------------------------------
5.7.0.11


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


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


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


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


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