ticket-1413 Fixed handling of undiscovered BLS public keys

[sergiy-skalelabs]

• Fixed handling of undiscovered BLS public keys
• • Added JSON RPC connectivity problems comments in logging

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (961e358) 85.79% compared to head (d4a565f) 85.79%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1581 +/- ## ======================================== Coverage 85.79% 85.79% ======================================== Files 26 26 Lines 1464 1464 Branches 401 401 ======================================== Hits 1256 1256 Misses 33 33 Partials 175 175 ```

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