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555203e1 - Warning for invalid options without "--with_prior_preservation" (#1065)

Warning for invalid options without "--with_prior_preservation" (#1065) * Make errors for invalid options without "--with_prior_preservation" * Make --instance_prompt required * Removed needless check because --instance_data_dir is marked with required * Updated messages * Use logger.warning instead of raise errors Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>