set_gsm_provider(): Don't use the SPN for the operator name if it's empty.

BUG=chrome-os-partner:4595
TEST=With a SIM with an empty-but-present SPN, check that the mobile
network service name is the carrier's (database-based) name rather
than an empty string.

Change-Id: I6dd280b1543becf8d02bb44cc9eb3f76cd4f2676
Reviewed-on: http://gerrit.chromium.org/gerrit/3158
Tested-by: Nathan J. Williams <njw@chromium.org>
Reviewed-by: Eric Shienbrood <ers@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/3267
1 file changed