Make 404 errors more useful - report the path asked for

Change-Id: If1dae28581080481052fef36be930fae55e324bc
diff --git a/visualisation/visualisation.py b/visualisation/visualisation.py
index f004f70..6bfbdf6 100644
--- a/visualisation/visualisation.py
+++ b/visualisation/visualisation.py
@@ -251,6 +251,7 @@
             self.wfile.write('Content-type: text/plain\r\n')
             self.end_headers()
             self.wfile.write('404 Not Found\r\n')
+            self.wfile.write('%s' % self.parsed_path.path)
             logging.error('VLAN graphic not found - asked for %s', self.parsed_path.path)
             return
 
@@ -361,6 +362,7 @@
         self.wfile.write('Content-type: text/plain\r\n')
         self.end_headers()
         self.wfile.write('404 Not Found')
+        self.wfile.write('%s' % self.parsed_path.path)
         logging.error('File not supported - asked for %s', self.parsed_path.path)
         return