fix: correctly handle errors from event decoder

[jeffsmale90]

In some cases, when decoding an event, Ganache UI will throw an error, with the message Cannot read property 'stack' of undefined.

Specifically, if three conditions are met:

• There must be a subscription to the event identifier. This happens if there has been a contract artifact loaded which defines an event with a matching signature, but as per condition 3, that contract must not exist in the artifacts.
• There must be a contract artifact loaded, which is deployed to the address that raises the event
• The contract artifacts must not declare an event with a matching signature.

Further details can be seen here: https://github.com/jeffsmale90/ganache-ui-stack-repro

This change fixes the issue, by correctly handling errors from the decoder. This means that if the above conditions are met, the decodedEvent promise resolves to undefined, which causes the caller to render the raw data as "Encoded Event".

See #5341 for a similar fix for decoding transactions.

Fixes: #5337
Fixes: #5324
Fixes: #5296
Fixes: #5273
Fixes: #5224
Fixes: #5188
Fixes: #5159
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Fixes: #1313