Crash in AssetsPricesHelper

[SergeyZhukovsky]

A user reported a crash on stable 1.73.101. We need to fix and uplift

java.lang.NullPointerException: Attempt to read from field 'java.lang.String WB.l' on a null object reference in method 'void org.chromium.chrome.browser.crypto_wallet.util.AssetsPricesHelper.fetchPrices(org.chromium.brave_wallet.mojom.AssetRatioService_Internal$Proxy, org.chromium.brave_wallet.mojom.BlockchainToken[], org.chromium.base.Callbacks$Callback1)'
        at org.chromium.chrome.browser.crypto_wallet.util.AssetsPricesHelper.fetchPrices(AssetsPricesHelper.java:33)
        at org.chromium.chrome.browser.crypto_wallet.util.Utils.lambda$getTxExtraInfo$15(Utils.java:1322)
        at org.chromium.chrome.browser.crypto_wallet.util.TokenUtils.lambda$getAllTokensFiltered$3(TokenUtils.java:172)
        at org.chromium.brave_wallet.mojom.BraveWalletService_Internal$BraveWalletServiceGetUserAssetsResponseParamsForwardToCallback.accept(BraveWalletService_Internal.java:2856)
        at org.chromium.mojo.bindings.RouterImpl.handleIncomingMessage(RouterImpl.java:223)
        at org.chromium.mojo.bindings.RouterImpl$HandleIncomingMessageThunk.accept(RouterImpl.java:29)
        at org.chromium.mojo.bindings.Connector.readAndDispatchMessage(Connector.java:194)
        at org.chromium.mojo.bindings.Connector.readOutstandingMessages(Connector.java:159)
        at org.chromium.mojo.bindings.Connector.onWatcherResult(Connector.java:137)
        at org.chromium.mojo.bindings.Connector$WatcherCallback.onResult(Connector.java:128)
        at org.chromium.mojo.system.impl.WatcherImpl.onHandleReady(WatcherImpl.java:60)
        at android.os.MessageQueue.nativePollOnce(Native Method)
        at android.os.MessageQueue.next(MessageQueue.java:342)
        at android.os.Looper.loopOnce(Looper.java:182)
        at android.os.Looper.loop(Looper.java:357)
        at android.app.ActivityThread.main(ActivityThread.java:8103)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1026)