An import of a tracker with a single issue breaks when the 
metakit backend attempts to import the issue. 
 
Traceback (most recent call last): 
  File "/home/rjones/src/roundup/roundup/roundup/admin.py", line 
1147, in run_command 
    ret = function(args[1:]) 
  File "/home/rjones/src/roundup/roundup/roundup/admin.py", line 
991, in do_import 
    maxid = max(maxid, int(cl.import_list(propnames, l))) 
  File 
"/home/rjones/src/roundup/roundup/roundup/backends/back_metakit.py", 
line 1123, in import_list 
    ndx = view.append(d) 
ValueError: Object has no usable attributes