Fixed memory leak when clickhouse raise error on data send.

[pulina]

• fixes Memory leak when clickhouse raise error on data send. #406

Checklist:

• Add tests that demonstrate the correct behavior of the change. Tests should fail without the change. # I did not spoot any test for cython code
• Add or update relevant docs, in the docs folder and in code. # Non required
• Ensure PR doesn't contain untouched code reformatting: spaces, etc.
• Run flake8 and fix issues. # to much issues to fix XD but as far as i can tell no issue added
• Run pytest no tests failed. See https://clickhouse-driver.readthedocs.io/en/latest/development.html.

[coveralls]

coverage: 96.091%. remained the same
when pulling 5d1b6e6 on pulina:Fixed_memory_leek_when_clickhouse_raise_error_on_data_send
into f088802 on mymarilyn:master.