Fix for Market not showing operator and operator billing on CDMA

The last commit to RuimRecords attempts to read the operator_numeric
and operator_iso_country from the ruim card.  For phones without
a ruim card the codes are set to null resulting in the Market not
showing the operator and operator billing options.  This patch
removes the null setting.

Change-Id: I2c5a2cdf002e7d5f270bee07c573ddaccbf55ca6