LEGAL PRACTITIONERS — solicitor — disciplinary proceedings — delay in attending to the affairs of a client — unsatisfactory professional conduct — statement of fact sworn to by solicitor in an affidavit — belief in the truth of the statement at time of swearing affidavit — no basis upon which to challenge that belief as unreasonable or reckless — subsequent event showed the facts to be untrue — in circumstances conduct neither professional misconduct nor unsatisfactory professional conduct