[Variability] PresenceConditionLiterals are not checked not to contain Keywords
At the moment, it is not checked for literal elements in presence conditions that their name is different from keywords like OR, AND, etc..
(from redmine: issue id 3862, created on 2019-11-05)
Testing Instructions:
- Open AF3.
- Create a FeatureModel.
- Add any kind of features with the names "NOT", "OR", "AND" and "DEFAULT"
- Observe: There are errors, each.
- Add any kind of feature with name "With Space".
- Observe: There is another error.
- Add any kind of feature with name "With}".
- Observe: There is another error.