When creating issue, URL validator prevents sending empty non-required field

[Martin Večeřa]

To reproduce:

• Have field of URL type in issue, non-required
• Open Create issue in VS Code Atlascode extension
• Try to create issue with the URL validated field empty
• Atlascode prevents creating the issue unless the field is filled in, even though it is not required

atlascode v 2.7.1

VS code 1.48.2

Windows 10 Pro