fix(aepp): don't call onDetected with empty wallet array

[davidyuk]

This happened for historical reasons, before the wallets object was the same for multiple calls of walletDetector.

This PR is supported by the Æternity Crypto Foundation

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02 🎉

Comparison is base (26014b7) 82.50% compared to head (80d97fa) 82.53%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1801      +/-   ##
===========================================
+ Coverage    82.50%   82.53%   +0.02%     
===========================================
  Files           90       90              
  Lines         3104     3103       -1     
  Branches       618      617       -1     
===========================================
  Hits          2561     2561              
+ Misses         251      250       -1     
  Partials       292      292              

Impacted Files	Coverage Δ
src/aepp-wallet-communication/wallet-detector.ts	26.31% <ø> (+1.31%)	⬆️

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