Allow the LockPatterUtils to be null

In some tests it could inconsistently become a null, crashing with NPE, for the reason I can't understand (maybe there is a race condition somewhere between mocking and accessing the LockPatterUtils in such tests)
Let's accept it gracefully

Test: atest SettingsUnitTests
Bug: 382637173
Flag: EXEMPT bugfix
Change-Id: I35d5faa1a29307fc780207a816680a32b2796bc0

src/com/android/settings/security/ScreenLockPreferenceDetailsUtils.java

@@ -23,6 +23,7 @@ import android.os.UserHandle;
 import android.os.UserManager;
 import android.os.storage.StorageManager;
 
+import androidx.annotation.Nullable;
 import androidx.annotation.StringRes;
 
 import com.android.internal.app.UnlaunchableAppActivity;
@@ -43,6 +44,7 @@ public class ScreenLockPreferenceDetailsUtils {
 
     private final int mUserId = UserHandle.myUserId();
     private final Context mContext;
+    @Nullable
     private final LockPatternUtils mLockPatternUtils;
     private final int mProfileChallengeUserId;
     private final UserManager mUm;
@@ -85,7 +87,7 @@ public class ScreenLockPreferenceDetailsUtils {
      * Returns whether the lock pattern is secure.
      */
     public boolean isLockPatternSecure() {
-        return mLockPatternUtils.isSecure(mUserId);
+        return mLockPatternUtils != null && mLockPatternUtils.isSecure(mUserId);
     }
 
     /**
@@ -148,6 +150,7 @@ public class ScreenLockPreferenceDetailsUtils {
         // profile with unified challenge on FBE-enabled devices. Otherwise, vold would not be
         // able to complete the operation due to the lack of (old) encryption key.
         if (mProfileChallengeUserId != UserHandle.USER_NULL
+                && mLockPatternUtils != null
                 && !mLockPatternUtils.isSeparateProfileChallengeEnabled(mProfileChallengeUserId)
                 && StorageManager.isFileEncrypted()) {
             if (mUm.isQuietModeEnabled(UserHandle.of(mProfileChallengeUserId))) {
@@ -166,8 +169,12 @@ public class ScreenLockPreferenceDetailsUtils {
                 .toIntent();
     }
 
+    @Nullable
     @StringRes
     private Integer getSummaryResId(int userId) {
+        if (mLockPatternUtils == null) {
+            return null;
+        }
         if (!mLockPatternUtils.isSecure(userId)) {
             if (userId == mProfileChallengeUserId
                     || mLockPatternUtils.isLockScreenDisabled(userId)) {