fix: do not use null as snapshot for EVM spaces

[Sekhmet]

Summary

I don't remember exactly why, but for EVM we don't support null as block (issue to investigate it: #805).

But we did use null for pending proposals. This PR prevents it.

How to test

1. You see your VP here: http://localhost:8080/#/sep:0xb58B05A1c8263441Bd74454544fD66CE25D300AD/proposal/61

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[wa0x6e]

tAck