* all:
  - Properties methods refactoring: return null if the property value is not found instead of throwing Java exception.
* (PropertyUtils.java):
   - Fix null pointer exception in the findProperty method.
* (AadlBaExamplesWizard.java):
   - Support already selected items.
add several forgotten cases in AadlBaUtils.getDataClassifier method
Merge pull request #14 from osate/develop

Develop