fix(vapp): pointer Features not initialized

[gaetanars]

Fix nil point dereference in UpdateNetworkAsync function on networkToUpdate.Configuration.Features

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Description

Related issue: #554

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[adezxc]

Hello @gaetanars, thank you for the contribution!

Funnily enough, we detected this bug yesterday, so I also implemented this change in #550 and we will proceed with that one, and close this one. Will close #554 when merged aswell.

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