Hide extra information link when it is empty

Extra information may be or may not be provided as this is given from the Carriers, therefore it is needed to hide when there is no given URL string

Bug: 360265682
Flag: EXEMPT bugfix
Test: manually test when extra information is valid and when extra information is empty
      https://b.corp.google.com/issues/360265682#comment2 for UI test
result

Change-Id: Icf7f06e6af8580d0e84382a2598be75e321cf657