Respond with null data when no biometrics.

Safety Center expects a response to the broadcast in this case.
The Settings app should respond with explicitely no data to Safety
Center rather than not respond.

Bug: 295143688
Test: atest BiometricsSafetySourceTest
Change-Id: Iea7f7c53919d90bf3d7fd989fb2f320a5c9ee9c6

src/com/android/settings/safetycenter/BiometricsSafetySource.java

@@ -164,7 +164,12 @@ public final class BiometricsSafetySource {
                     disablingAdmin == null /* enabled */,
                     fingerprintStatusUtils.hasEnrolled(),
                     safetyEvent);
+            return;
         }
+
+        SafetyCenterManagerWrapper.get()
+                .setSafetySourceData(
+                        context, SAFETY_SOURCE_ID, /* safetySourceData= */ null, safetyEvent);
     }
 
     /** Notifies Safety Center of a change in biometrics settings. */