chore(typeorm-utils): improvement

[Tony133]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

N/A

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

This PR, It replaces theisNullOrUndefined method as it is deprecated, following the following warning message:
deprecated - use value === null || value === not defined

[kamilmysliwiec]

LGTM

[kamilmysliwiec]

I had to revert this PR since it broke the build #813