Make JPetParamGetter base class' destructor virtual
Make JPetParamGetter base class' destructor virtual


Former-commit-id: 5861829e1ccf45f2cc5b3f9b8b1a286cd289669e
kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework