erp5_computer_metadata: update view script

Print a tree of file names instead of a pretty-printed JSON object.
It is better because the full JSON object can overload the browser.

bt5/erp5_computer_metadata/SkinTemplateItem/portal_skins/erp5_computer_metadata/ComputerMetadataSnapshot_preview.py

 import json
 
-return json.dumps(json.loads(context.getData()), sort_keys=True, indent=4)
+def traverse(d, depth):
+  res = ""
 
-
-def traverse(name, cur_dict, depth):
-  raise NotImplementedError(cur_dict)
-  for key, value in cur_dict['childs']:
+  for name, value in d.iteritems():
     for i in range(depth):
-      print "  ",
-    print name
-    traverse(key, value['childs'], depth+1)
+      res += "\t"
+    res += name + "\n"
+    if len(value['childs']) > 0:
+      res += traverse(value['childs'], depth+1)
 
-traverse("", json.loads(context.getData())['fs_tree'], 0)
+  return res
 
-return printed
+return traverse(json.loads(context.getData())['fs_tree']['childs'], 0)

bt5/erp5_computer_metadata/SkinTemplateItem/portal_skins/erp5_computer_metadata/ComputerMetadataSnapshot_preview.xml

@@ -56,15 +56,6 @@
             <key> <string>id</string> </key>
             <value> <string>ComputerMetadataSnapshot_preview</string> </value>
         </item>
-        <item>
-            <key> <string>warnings</string> </key>
-            <value>
-              <tuple>
-                <string>Prints, but never reads \'printed\' variable.</string>
-                <string>Doesn\'t print, but reads \'printed\' variable.</string>
-              </tuple>
-            </value>
-        </item>
       </dictionary>
     </pickle>
   </record>