Revise lockdown check in getLegacyVpnInfo()

Return null instead of raising exception in lockdown mode.

BUG=22749146

Change-Id: I0e9e3ded0d189e3fa9e872b7af9fe363799c85d6
1 file changed
tree: 29ea68582ac8f9c4335e7557ccd5a2c88f589149
  1. core/
  2. services/
  3. tests/