fix(material): disable floating label when select value is empty (#1707)
fix(material): disable floating label when select value is empty (#1707)


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