pmd Fixes

src/qdev4/Ex1.java

src/tp04/PendingCaseQueue.java

src/tp06/Car.java

src/tp06/Company.java

src/tp06/TravellingSalesperson.java

src/tp06/Vendor.java

src/tp09/LogInManagement.java

src/tp09/Main.java

src/tp09/WrongLoginException.java