Fix/missing collection date

[KateSakharova]

Error validating sample SRR3719567_concoct_52 with checklist id ERC000047.
        Error at . The value "missing" for field "collection date" does not match regular expression "(^[12][0-9]{3}(-(0[1-9]|1[0-2])(-(0[1-9]|[12][0-9]|3[01])(T[0-9]{2}:[0-9]{2}(:[0-9]{2})?Z?([+-][0-9]{1,2})?)?)?)?(/[0-9]{4}(-[0-9]{2}(-[0-9]{2}(T[0-9]{2}:[0-9]{2}(:[0-9]{2})?Z?([+-][0-9]{1,2})?)?)?)?)?$)|(^not collected$)|(^not provided$)|(^restricted access$)|(^missing: control sample$)|(^missing: sample group$)|(^missing: synthetic construct$)|(^missing: lab stock$)|(^missing: third party data$)|(^missing: data agreement established pre-2023$)|(^missing: endangered species$)|(^missing: human-identifiable$)"
        Error validating sample SRR3719572_binner13_Refined_37 with checklist id ERC000047.
        Error at . The value "missing" for field "collection date" does not match regular expression "(^[12][0-9]{3}(-(0[1-9]|1[0-2])(-(0[1-9]|[12][0-9]|3[01])(T[0-9]{2}:[0-9]{2}(:[0-9]{2})?Z?([+-][0-9]{1,2})?)?)?)?(/[0-9]{4}(-[0-9]{2}(-[0-9]{2}(T[0-9]{2}:[0-9]{2}(:[0-9]{2})?Z?([+-][0-9]{1,2})?)?)?)?)?$)|(^not collected$)|(^not provided$)|(^restricted access$)|(^missing: control sample$)|(^missing: sample group$)|(^missing: synthetic construct$)|(^missing: lab stock$)|(^missing: third party data$)|(^missing: data agreement established pre-2023$)|(^missing: endangered species$)|(^missing: human-identifiable$)"
        Error validating sample SRR3719647_concoct_38 with checklist id ERC000047.