dropbox filestatus crashes in a dir with only unsynced files

[Matthäus Brandl]

When running "dropbox filestatus" in a directory which only contains files which are no longer synced, the tool crashes with the following error:
% dropbox filestatus (-a)
Traceback (most recent call last):
  File "/usr/bin/dropbox", line 1360, in <module>
    ret = main(sys.argv)
  File "/usr/bin/dropbox", line 1349, in main
    result = commands[argv[i]](argv[i+1:])
  File "/usr/bin/dropbox", line 694, in newmeth
    return meth(*n, **kw)
  File "/usr/bin/dropbox", line 935, in filestatus
    indent = max(len(st)+1 for st in args)
ValueError: max() arg is an empty sequence

In any other directory it works as expected, as does
% dropbox filestatus -l
<empty>

% LC_ALL=C apt-cache policy nautilus-dropbox
nautilus-dropbox:
  Installed: 1.4.0
  Candidate: 1.4.0
  Version table:
 *** 1.4.0 0
        500 http://linux.dropbox.com/ubuntu/ oneiric/main i386 Packages
        100 /var/lib/dpkg/status
     0.6.8-1 0
        500 http://de2.archive.ubuntu.com/ubuntu/ oneiric/multiverse i386 Packages