FIX: Show title as home logo if title has been set and logo is blank.

https://meta.discourse.org/t/default-text-logo-not-working/103936

app/models/site_setting.rb

@@ -175,8 +175,19 @@ class SiteSetting < ActiveRecord::Base
     site_logo_small_url
     site_mobile_logo_url
     site_favicon_url
+    site_home_logo_url
   }.each { |client_setting| client_settings << client_setting }
 
+  def self.site_home_logo_url
+    upload = SiteSetting.logo
+
+    if SiteSetting.defaults.get(:title) != SiteSetting.title && !upload
+      ''
+    else
+      full_cdn_url(upload ? upload.url : '/images/d-logo-sketch.png')
+    end
+  end
+
   def self.site_logo_url
     upload = self.logo
     upload ? full_cdn_url(upload.url) : self.logo_url(warn: false)