Fix possible panic in case broken protocol

[azat]

stacktrace:

thread '<unnamed>' panicked at 'called `Option::unwrap()` on a `None` value', /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/io/transport.rs:122:31

   8: core::option::Option<T>::unwrap
             at /rustc/0ab38e95bb1cbf0bd038d359bdecbfa501f003a7/library/core/src/option.rs:935:21
   9: clickhouse_rs::io::transport::ClickhouseTransport::clear::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/io/transport.rs:122:29
  10: clickhouse_rs::ClientHandle::ping::{{closure}}::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/lib.rs:340:59
  11: <tokio::time::timeout::Timeout<T> as core::future::future::Future>::poll
             at /home/azat/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/time/timeout.rs:202:33
  12: clickhouse_rs::with_timeout::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/lib.rs:641:43
  13: clickhouse_rs::ClientHandle::ping::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/lib.rs:365:10
  14: clickhouse_rs::retry_guard::check::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/retry_guard.rs:57:14
  15: clickhouse_rs::retry_guard::retry_guard::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/retry_guard.rs:21:33
  16: clickhouse_rs::ClientHandle::check_connection::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/lib.rs:586:78
  17: clickhouse_rs::ClientHandle::wrap_stream::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/lib.rs:555:89
  ...
  26: clickhouse_rs::with_timeout::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/lib.rs:641:43
  27: clickhouse_rs::types::query_result::QueryResult::fetch_all::{{closure}}
             at /home/azat/.cargo/git/checkouts/clickhouse-rs-37da3cb97e01332d/afd8ce5/src/types/query_result/mod.rs:47:10

[azat]

@suharev7 can you take a look please?

[suharev7]

Thanks