Picard cannot rename / save files

[tdn]

Sometimes Picard cannot save/rename files. When press Ctrl+S Picard says:

E: 139678084437728 13:46:29 Traceback (most recent call last):
  File "/var/lib/python-support/python2.5/picard/util/thread.py", line 61, in run
    result = func()
  File "/var/lib/python-support/python2.5/picard/file.py", line 149, in _save_and_rename
    new_filename = self._rename(old_filename, metadata, settings)
  File "/var/lib/python-support/python2.5/picard/file.py", line 240, in _rename
    os.makedirs(new_dirname)
  File "/usr/lib/python2.5/os.py", line 171, in makedirs
    mkdir(name, mode)
OSError: [Errno 2] No such file or directory: ''

E: 139678084437728 13:46:29 Traceback (most recent call last):
  File "/var/lib/python-support/python2.5/picard/util/thread.py", line 61, in run
    result = func()
  File "/var/lib/python-support/python2.5/picard/file.py", line 149, in _save_and_rename
    new_filename = self._rename(old_filename, metadata, settings)
  File "/var/lib/python-support/python2.5/picard/file.py", line 240, in _rename
    os.makedirs(new_dirname)
  File "/usr/lib/python2.5/os.py", line 171, in makedirs
    mkdir(name, mode)
OSError: [Errno 2] No such file or directory: ''

E: 139678084437728 13:46:29 Traceback (most recent call last):
  File "/var/lib/python-support/python2.5/picard/util/thread.py", line 61, in run
    result = func()
  File "/var/lib/python-support/python2.5/picard/file.py", line 149, in _save_and_rename
    new_filename = self._rename(old_filename, metadata, settings)
  File "/var/lib/python-support/python2.5/picard/file.py", line 240, in _rename
    os.makedirs(new_dirname)
  File "/usr/lib/python2.5/os.py", line 171, in makedirs
    mkdir(name, mode)
OSError: [Errno 2] No such file or directory: ''

E: 139678084437728 13:46:29 Traceback (most recent call last):
  File "/var/lib/python-support/python2.5/picard/util/thread.py", line 61, in run
    result = func()
  File "/var/lib/python-support/python2.5/picard/file.py", line 149, in _save_and_rename
    new_filename = self._rename(old_filename, metadata, settings)
  File "/var/lib/python-support/python2.5/picard/file.py", line 240, in _rename
    os.makedirs(new_dirname)
  File "/usr/lib/python2.5/os.py", line 171, in makedirs
    mkdir(name, mode)
OSError: [Errno 2] No such file or directory: ''

I have not yet found a pattern. I have checked permissions on the files, that is not the problem.
First, I thought it might be because the files had spaces int he file names, but it turned out that it was not the problem.

[Charlie_Smotherman (cjsmo)]

this has been corrected in 0.16-1. Setting to fixed released