ST6RI-836 getProjectById returns null of project doesn't exist

- when trying to query a project by id instead of throwing an exception
getProjectById return null. This matches with the logic used in by
getProjectByName

Author: TheKorpos

org.omg.sysml/src/org/omg/sysml/util/repository/ProjectRepository.java

@@ -185,7 +185,11 @@ public RemoteProject getPRojectById(UUID projectId) {
 			Project projectById = getProjectApi().getProjectById(projectId);
 			return projectById == null? null: new RemoteProject(this, projectId, projectById.getName());
 		} catch (ApiException e) {
-			throw new RemoteException("Error occured while trying to query the project", e);
+			if (e.getCode() == 404) {
+				return null;
+			} else {
+				throw new RemoteException("Error occured while trying to query the project", e);
+			}
 		}
 	}