Fix boolean argument serialization appending empty string

Dan Notesteinrequested to merge
fix/boolean-argument-serialization into develop

Summary

Boolean flags like --replay-blockchain were incorrectly serialized with an empty string value appended, producing ['--replay-blockchain', ''] instead of just ['--replay-blockchain'].

This caused hived to fail on startup when tests used boolean arguments like replay_blockchain=True.

Changes

Modified __prepare_arguments in arguments.py to check if the converted value is non-empty before appending it to the CLI arguments list.

Test plan

  • Verify boolean flags produce correct CLI output (e.g., --replay-blockchain without trailing empty string)
  • Run hive CI tests that use replay_from parameter

Merge request reports