Range picker with autoApply breaks upon clearing input from keyboard

[nekitk]

Describe the bug
When trying to clear text input of Datepicker in range mode with autoApply set to true, page breaks with error:

Cannot read properties of null (reading 'length')

To Reproduce
Steps to reproduce the behavior:

1. Go to https://codesandbox.io/s/vue3-date-time-picker-demo-forked-c7ter?file=/src/components/Demo.vue
   Or create new component elsewhere with this set of props:
   <Datepicker v-model="date" range text-input auto-apply />
2. Using keyboard delete all the text from date input (e.g. press Tab and then Backspace/Delete)

Expected behavior
Input should become empty and value should be set to null.
It works that way when autoApply is set to false or when Datepicker is in single date mode.
Clearing input by clicking on 'x' also works without any problem

Screenshots

Video: https://user-images.githubusercontent.com/7345182/153621929-4a5fb0ea-e78a-4703-8597-c6a7ec8510d4.mp4

Desktop (please complete the following information):

• OS: macOS 12.2
• Browser Chrome
• Version 98

[nekitk]

Tried different versions in sandbox and it seems like it has broken in version 2.3.6
Version 2.3.5 doesn't break upon clearing input.