Pim 3326 stable : Fix mongo filters with multiples values and empty

| Q                    | A
| -------------------- | ---
| Bug fix?             | Y
| New feature?         | N
| BC breaks?           | N
| CI currently passes? | ?
| Tests pass?          | ?
| Scenarios pass?      | ?
| Checkstyle issues?*  | N
| PMD issues?**        | N
| Changelog updated?   | N
| Fixed tickets        | PIM-3326
| DB schema updated?   | N
| Migration script?    | N
| Doc PR               | N
@sumbobyboys Don't forget that your features should be readable too. So using "1564215NKE546\1" as a SKU is maybe not the most valuable thing you can do ;)
I agree with you about real data but I think MUG-1, etc. are good SKUs for testing :)