Fix null pointer exception in getNodeError check for ExecutionRevertedError

[tuna1207]

Overview

This PR fix null pointer exception in getNodeError check for ExecutionRevertedError

Detailed summary

When using viem client with custom provider, i faced null pointer exception because the error walk check for ExecutionRevertedError in getNodeError didn't check for null cause in error returned from provider.
This PR added null check in ExecutionRevertedError walk check and test case for it.

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PR-Codex overview

This PR focuses on fixing an undefined reference issue in the getNodeError function and adding a new test case for handling errors with a null cause.

Detailed summary

• Fixed undefined reference in getNodeError by updating the type check to handle null and undefined values.
• Added a new test case for UnknownNodeError to check error handling when the cause is null.

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🦋 Changeset detected

Latest commit: 522cd09

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
viem	Patch

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