Gracefully handle when Redis is not available

config/initializers/1_settings.rb

@@ -295,5 +295,10 @@ if Rails.env.test?
 end
 # Force a refresh of application settings at startup
-ApplicationSetting.expire
-Ci::ApplicationSetting.expire
+begin
+  ApplicationSetting.expire
+  Ci::ApplicationSetting.expire
+rescue
+  # Gracefully handle when Redis is not available. For example,
+  # omnibus may fail here during assets:precompile.
+end