kwallet keyring backend doesn't work

[robert-zaremba]

Summary of Bug

I'm trying to create a new keyring wallet with kwallet backend.

Version

SDK: 0.43-beta
kwallet 5.82.0-1 (kf5)
OS: Arch Linux

Steps to Reproduce

Adding keys to a kwallet based keyring wallet doesn't work:

It doesn't work:

./build/simd keys add newkey --keyring-backend kwallet
Error: unexpected end of JSON input

The wallet was initially empty, after the command above, simd wallet was created, but with no keys:

The error comes from this line: https://github.com/cosmos/cosmos-sdk/blob/robert%2Fcosmvisor-file-watch/crypto/keyring/keyring.go#L788

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[robert-zaremba]

cc; @alessio