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Trap failure to get password from keyring

It happens when using upload.py from a ssh session without a X session but
gnomekeyring is used.

R=dpranke@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7715013

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@97909 0039d316-1c4b-4281-b951-d872f2087c98