Hide the empty buckets when selected network is empty.

Sometimes the selected network (operator) has empty parentheses. For example,
it's the default value for automatically selected network. Hide the
empty parentheses by moving it from hardcoded string to the actual
string value.

Change-Id: I511b5eb84b5b6f142cc2406ab8eb884a5a29acb8
Test: Manual
Bug: 114066643
2 files changed