Move color-logic into HipchatService#HipchatService

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/models/project_services/hipchat_service.rb

@@ -68,7 +68,7 @@ class HipchatService < Service
   end
 
   def message_options(data = nil)
-    { notify: notify.present? && notify == '1', color: build_status_color(data) || color || 'yellow' }
+    { notify: notify.present? && notify == '1', color: message_color(data) }
   end
 
   def create_message(data)
@@ -240,6 +240,10 @@ class HipchatService < Service
     "#{project_link}: Commit #{commit_link} of #{branch_link} #{ref_type} by #{user_name} #{humanized_status(status)} in #{duration} second(s)"
   end
 
+  def message_color(data)
+    build_status_color(data) || color || 'yellow'
+  end
+
   def build_status_color(data)
     return unless data && data[:object_kind] == 'build'