Apply ternary to null operator

[peter279k]

Q	A
Branch	2.x
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	no
Documented?	no

It should use the ternary null operator to process the variable is null.

New Task Checklist:

• [x] Are the dependencies added to the composer.json suggestions?
• [x] Is the doc/tasks.md file updated?
• [x] Are the task parameters documented?
• [x] Is the task registered in the tasks.yml file?
• [x] Does the task contains phpunit tests?
• [x] Is the configuration having logical allowed types?
• [x] Does the task run in the correct context?
• [x] Is the run() method readable?
• [x] Is the run() method using the configuration correctly?
• [x] Are all CI services returning green?

[veewee]

Thanks! :)