eth_call fails with error message 'to'

[s-medvedev]

Symptom:
eth_call fails with error message to

STR:
Pass OpenZeppelin tests and analyze results for requests in the proxy log

Actual result:
Some of eth_call requests fails with "error": {"code": -32000, "message": "'to'"}

Expected result:
Successful execution

Additional info:
The proxy log contains:

Traceback (most recent call last):
  File "/opt/proxy/plugin/solana_rest_api.py", line 576, in process_request
    response['result'] = method(*request['params'])
  File "/opt/proxy/plugin/solana_rest_api.py", line 262, in eth_call
    contract_id = obj['to']
KeyError: 'to'