Do not display projects without DMSF available

lib/redmine_dmsf/webdav/base_resource.rb

@@ -207,9 +207,22 @@ module RedmineDmsf
 
       def load_projects(project_scope)
         project_scope.visible.find_each do |p|
+          if dmsf_available?(p)
             @children << child_project(p)
           end
         end
+      end
+
+      private
+
+      # Go recursively through the project tree until a dmsf enabled project is found
+      def dmsf_available?(p)
+        return true if(p.visible? && p.module_enabled?(:dmsf))
+        p.children.each do |child|
+          return true if dmsf_available?(child)
+        end
+        false
+      end
 
     end
   end

lib/redmine_dmsf/webdav/project_resource.rb

@@ -71,7 +71,7 @@ module RedmineDmsf
       end
 
       def etag
-        sprintf '%x-%x-%x', 0, 4096, last_modified.to_i
+        sprintf '%x-%x-%x', 0, 4096, (last_modified ? last_modified.to_i : 0)
       end
 
       def name

test/integration/webdav/dmsf_webdav_get_test.rb

@@ -61,11 +61,11 @@ class DmsfWebdavGetTest < RedmineDmsf::Test::IntegrationTest
     assert_match project1_uri, response.body
   end
 
-  def test_should_list_non_dmsf_enabled_project
+  def test_should_not_list_non_dmsf_enabled_project
     @project2.disable_module! :dmsf
     get '/dmsf/webdav', params: nil, headers: @jsmith
     assert_response :success
-    assert response.body.match(@project2.identifier)
+    assert !response.body.match(@project2.identifier)
   end
 
   def test_should_return_status_404_when_project_does_not_exist