Failed to decode events with omitted indexed values.

EVM connect could not index https://amoy.polygonscan.com/tx/0x4213981818bd5bc57b6bc7b9fd79e75927cee91bfac2b1a73b81fe17d885ef80#eventlog

due to

```
ERROR evmconnect: Failed to process event log: FF22053: Ran out of topics for indexed fields at field 2 of Approval(address,address,uint256)
```

This is because the decoding logic assumes all index fields in an event will be recorded in topics. However, for the example above, the tokenId was omitted.