Resolve "Réorganisation criterion (null, not null)"

Closes #41 (closed)

client/src/app/instance/search/components/criteria/search-type/date.component.ts

@@ -23,6 +23,7 @@ export class DateComponent extends AbstractSearchTypeComponent {
         if (criterion) {
             this.form.controls.date.setValue(new Date((criterion as FieldCriterion).value));
         } else {
+            this.form.controls.operator.setValue(this.attribute.operator);
            if(! this.attribute.dynamic_operator){
             this.operators = searchTypeOperators.filter(
                 operator => [this.attribute.operator, 'nl', 'nnl'].includes(operator.value)