Exception when executing locate command on non-existing/unreadable path

Originally reported on Google Code with ID 51

What steps will reproduce the problem?
1. Execute "boar locate --repo=/some/repo locate SomeSession /non-existing/path"

What is the expected output? What do you see instead?
There should be a nice error message. There is an ugly exception.

Please use labels and text to provide additional information.

Reported by mats_ekberg on 2012-02-11 10:09:22

Would "the ugly exception" be the following?

 $ boar locate bilder *.jpg                                                                                                                   
Traceback (most recent call last):                                                                                                                                       
  File "/usr/local/bin/boar", line 1497, in <module>
    return_code = main()
  File "/usr/local/bin/boar", line 1422, in main
    return cmd_locate(args[1:])
  File "/usr/local/bin/boar", line 207, in cmd_locate
    csum = md5sum_file(f)
  File "/opt/boar/common.py", line 212, in md5sum_file
    return checksum_file(f, ["md5"], start, end, progress_callback = progress_callback)[0]
  File "/opt/boar/common.py", line 245, in checksum_file
    with safe_open(f, "rb") as fobj:
  File "/opt/boar/common.py", line 192, in safe_open
    return open(path, "rb")                                                                                                                                              
IOError: [Errno 2] No such file or directory: u'/mnt/storbackup/*.jpg'

Or is that another error? I'm trying to figure out how to find a file in the boar repo. Using the command boar locate --repo=MYREPO locate MYSESSION *.jpg results in the error above.