[Blaze] Fix NPE in the Blaze payments WebView

[hichamboushaba]

Closes: #13623

Description

This PR fixes a crash in the Blaze payments WebView, the issue is that when the user taps on the "back" button in the WebView, it will navigate to me/payment-methods, this is the same URL that the API is returning as the success URL, so when this happens we will try to fetch a new added payment method, and when we don't detect a new one, we set the selection to null, which was a mistake, as we need to keep the previously selected method.

Steps to reproduce

1. Launch the Blaze campaign creation form.
2. Proceed to the creation.
3. In the Payments screen, choose "Add a new payment method"
4. Tap on the "Back" button inside the WebView.

Testing information

• Confirm the app doesn't crash, and the previously selected method stays selected.

The tests that have been performed

^

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

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• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	7453766
	Direct Download	woocommerce-wear-prototype-build-pr13624-7453766.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	7453766
	Direct Download	woocommerce-prototype-build-pr13624-7453766.apk

[irfano]

Good catch, @hichamboushaba! That fixed the issue. Looks good to me! 👍🏻