Date picker fixes

Author: kkartunov

src/shared/components/GUIKit/Datepicker/index.jsx

@@ -41,7 +41,7 @@ function Datepicker({
         date={date}
         onDateChange={(changedDate) => {
           setDate(changedDate);
-          onChange(changedDate.toDate());
+          onChange(changedDate ? changedDate.toDate() : null);
         }}
         focused={focused}
         onFocusChange={({ focused: changedFocused }) => setFocused(changedFocused)

src/shared/components/Gigs/GigApply/index.jsx

@@ -176,7 +176,7 @@ export default function GigApply(props) {
                       <Datepicker
                         placeholder="Available From"
                         label="Available From"
-                        onChange={val => onFormInputChange('availFrom', val.toISOString())}
+                        onChange={val => onFormInputChange('availFrom', val ? val.toISOString() : null)}
                         errorMsg={formErrors.availFrom}
                         value={formData.availFrom}
                       />