config: deal with sparse environment [1312057]

rteval failed while running in a test environment with the following error:

File "/usr/lib/python2.7/site-packages/rteval/rtevalConfig.py", line 41, in default_config_search
    (os.getenv('SUDO_USER') or os.getenv('USER'))), '.rteval'),
TypeError: cannot concatenate 'str' and 'NoneType' objects

Add this patch to deal with no SUDO_USER or USER environment variable in sparse
environments.

Signed-off-by: Clark Williams <williams@redhat.com>
1 file changed