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


Former-commit-id: 1efe0c32086271cf0bf3074c171b0a4bdb4a6553
kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework