message: feat(wasi) Replace `unwrap_or` by `from_utf8_lossy`.
  Since `env` contains a nul byte, it's better to get a lossy version of
  it. Moreover, it removes one more `unwrap`.
diff: @@ -334,7 +334,7 @@ impl WasiStateBuilder {
  return Err(WasiStateCreationError::EnvironmentVariableFormatError(
  format!(
  "found nul byte in env var string \"{}\" (key=value)",
  - std::str::from_utf8(env).unwrap_or("Inner error: env var is invalid_utf8!")
  + String::from_utf8_lossy(env)
  ),
  ));
  }
  