Make reverse lookup implement the phone number lookup interface (1/2)

Change-Id: I35195d6c5a89cf22ac0f31d48e2ef89102a453c1
Dialer: fix NPE in ReverseLookupService.doLookup

-also little fix in coding style

Change-Id: I333c390257685fd23e1f212a95f184be0b39f0bf