fix(core): allow false value for legacy select-option
fix(core): allow false value for legacy select-option

formly-js/ng2-formly,formly-js/ng-formly,formly-js/ng-formly,ngx-formly/ngx-formly,ngx-formly/ngx-formly,formly-js/ng2-formly,ngx-formly/ngx-formly,formly-js/ng2-formly,ngx-formly/ngx-formly