Adding null checks to PackageIntentReceiver in contacts provider

An explicit broadcast with null values was resulting in
android.process.acore crashing due to NPE.

Test: Manual - running shell command 'adb shell am broadcast -n
com.android.providers.contacts/.PackageIntentReceiver' no longer crashes
android.process.acore

Bug: 32071885
Change-Id: I9fdf5bbf1abe8056af37b8588f81f332c209b7fa
1 file changed