[2.2][Yaml] Fixed resolving blank values

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7274
| License       | MIT
| Doc PR        | -

Also, Seldaek suggested to rename the $notEOF variable.