fixes bug #1127

pboard/pboard/controllers/api.py

       # TODO - D.A. - 2013-11-07 - Check that new parent is accessible by the user !!!
       loNewNode = loApiController.getNode(node_id)
       if new_parent_id!='':
+        if new_parent_id==0:
+          new_parent_id = None
         loNewNode.parent_id = int(new_parent_id)
       pm.DBSession.flush()
       redirect(lurl('/document/%s'%(node_id)))

pboard/pboard/lib/dbapi.py

     for loNode in loNodeList:
       loTmpDict[loNode.node_id] = loNode
   
-      if loNode.parent_id==None:
+      if loNode.parent_id==None or loNode.parent_id==0:
         loTreeList.append(loNode)
       else:
         # append the node to the parent list
         # We suppose that the parent node has already been added
         # this *should* be the case, but the code does not check it
         if loNode.parent_id not in loTmpDict.keys():
-          print('THE NODE =========',loNode.parent_id)
           try:
+
             loTmpDict[loNode.parent_id] = self.getNode(loNode.parent_id)
           except Exception as e:
             # loTreeList.append(