Fix OnboardingViewModel range exception (#26317)

Fix onboarding range exception

android/java/org/chromium/chrome/browser/crypto_wallet/fragments/onboarding/OnboardingRecoveryPhraseFragment.java

@@ -6,6 +6,7 @@
 package org.chromium.chrome.browser.crypto_wallet.fragments.onboarding;
 
 import android.os.Bundle;
+import android.text.TextUtils;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -137,6 +138,9 @@ public class OnboardingRecoveryPhraseFragment extends BaseOnboardingWalletFragme
             keyringService.getWalletMnemonic(
                     mOnboardingViewModel.getPassword(),
                     result -> {
+                        if (TextUtils.isEmpty(result)) {
+                            return;
+                        }
                         mRecoveryPhrases = Utils.getRecoveryPhraseAsList(result);
                         mRecoveryPhraseAdapter.setRecoveryPhraseList(mRecoveryPhrases);
                         mRecoveryPhraseRecyclerView.setAdapter(mRecoveryPhraseAdapter);

android/java/org/chromium/chrome/browser/crypto_wallet/fragments/onboarding/OnboardingVerifyRecoveryPhraseFragment.java

@@ -195,7 +195,9 @@ public class OnboardingVerifyRecoveryPhraseFragment extends BaseOnboardingWallet
         super.onResume();
         if (mVerificationStep != null && mWordToMatch == null) {
             mWordToMatch = mOnboardingViewModel.getVerificationStep(mVerificationStep);
-            mCheckWord.setText(getString(R.string.enter_word, mWordToMatch.first + 1));
+            if (mWordToMatch != null) {
+                mCheckWord.setText(getString(R.string.enter_word, mWordToMatch.first + 1));
+            }
         }
     }
 

android/java/org/chromium/chrome/browser/crypto_wallet/model/OnboardingViewModel.java

@@ -64,10 +64,12 @@ public class OnboardingViewModel extends ViewModel {
         return mPassword;
     }
 
-    @NonNull
+    @Nullable
     public Pair<Integer, String> getVerificationStep(@NonNull final VerificationStep step) {
         assert mVerificationWords.size() != 0 : "Verification word list must not be empty.";
-
+        if (mVerificationWords.size() <= step.getValue()) {
+            return null;
+        }
         return extractPositionAndWordAtIndex(step.getValue());
     }