Fix a bug if the config file did not exist.
Fix a bug if the config file did not exist.

The confparser always returns an array. The code was expecting an
empty string if the requested file did not exist. Modified to handle
an empty array to signify that the file was not found, per the
ConfigParser docs.

plantigrade/geni-tools,GENI-NSF/gram,GENI-NSF/gram,ahelsing/geni-tools,tcmitchell/geni-tools,ahelsing/geni-tools,GENI-NSF/gram,plantigrade/geni-tools,tcmitchell/geni-tools