added empty/notEmpty operator, run npm audit fix

[EdgBuc]

Description

Hello, using your lib, thought I can contribute a little, so suggesting to add new operator to defaults.

Todo

Checklist

Please ensure your pull request fulfills the following requirements:

• [ x ] The commit messages follow our guidelines (CONTRIBUTING.md).
• [ x ] Tests for any changes have been added (for bug fixes / features).
• [ x ] Docs have been added / updated (for bug fixes / features).

Type

What kind of change does this pull request introduce?

[ ] Bug.
[ x ] Feature.
[ ] Code style update (formatting, local variables).
[ ] Refactoring (no functional changes, no api changes).
[ ] Build related changes.
[ ] CI related changes.
[ ] Documentation content changes.
[ ] Other (please describe below).

Breaking Changes

Does this pull request introduce any breaking changes?

[ ] Yes
[ x ] No

Other Information

Additionally, there are some fixes made by "npm audit fix".

n/a