Add null check for SensitiveContentProtectionService

mSensitiveContentProtectionService shouldn't be null when
sensitiveContentAppProtection() is true, adding wtf log to
track this.

Bug: 327305331
Test: atest SystemUIGoogleRobo2RNGTests
Change-Id: Ie655b63e7ddc387119edd40fc37a1ba3d11255b2
1 file changed