🩹(react) handle possible null date range

Exercise caution when dealing with date range values that may be null.

packages/react/src/components/Forms/DatePicker/DatePickerAux.tsx

@@ -116,7 +116,7 @@ const DatePickerAux = forwardRef(
                     type="hidden"
                     name={name && `${name}_start`}
                     value={convertDateValueToString(
-                      pickerState.value.start,
+                      pickerState.value?.start ?? null,
                       props.timezone,
                     )}
                   />
@@ -124,7 +124,7 @@ const DatePickerAux = forwardRef(
                     type="hidden"
                     name={name && `${name}_end`}
                     value={convertDateValueToString(
-                      pickerState.value.end,
+                      pickerState.value?.end ?? null,
                       props.timezone,
                     )}
                   />

packages/react/src/components/Forms/DatePicker/DateRangePicker.tsx

@@ -64,8 +64,8 @@ export const DateRangePicker = ({
     () =>
       !isFocused &&
       !pickerState.isOpen &&
-      !pickerState.value.start &&
-      !pickerState.value.end,
+      !pickerState.value?.start &&
+      !pickerState.value?.end,
     [pickerState.value, pickerState.isOpen, isFocused],
   );