Handle error on trace raw download with old builds (DB stored)

app/controllers/projects/builds_controller.rb

@@ -78,7 +78,7 @@ class Projects::BuildsController < Projects::ApplicationController
   end
 
   def raw
-    if @build.has_trace?
+    if @build.has_trace_file?
       send_file @build.path_to_trace, type: 'text/plain; charset=utf-8', disposition: 'inline'
     else
       render_404

app/models/ci/build.rb

@@ -208,6 +208,10 @@ module Ci
       end
     end
 
+    def has_trace_file?
+      File.exist?(path_to_trace) || (project.ci_id && File.exist?(old_path_to_trace))
+    end
+
     def has_trace?
       raw_trace.present?
     end

app/views/projects/builds/_sidebar.html.haml

@@ -100,7 +100,7 @@
         - elsif @build.runner
           \##{@build.runner.id}
       .btn-group.btn-group-justified{ role: :group }
-        - if @build.has_trace?
+        - if @build.has_trace_file?
           = link_to 'Raw', raw_namespace_project_build_path(@project.namespace, @project, @build), class: 'btn btn-sm btn-default'
         - if @build.active?
           = link_to "Cancel", cancel_namespace_project_build_path(@project.namespace, @project, @build), class: 'btn btn-sm btn-default', method: :post