code: public List<String> getIdsAddOnDependencies() {
  		if (dependencies == null) {
  			return Collections.emptyList();
  		}
  
  		List<String> ids = new ArrayList<>(dependencies.getAddOns().size());
  		for (AddOnDep dep : dependencies.getAddOns()) {
  			ids.add(dep.getId());
  		}
  		return ids;
  	}
docs: Returns the IDs of the add-ons dependencies, an empty collection if none.
  
  @return the IDs of the dependencies.
  @since 2.4.0