Fixed the printing of two warnings

src/storm/solver/Z3LpSolver.cpp

@@ -24,7 +24,7 @@ namespace storm {
         
 #ifdef STORM_HAVE_Z3_OPTIMIZE
         Z3LpSolver::Z3LpSolver(std::string const& name, OptimizationDirection const& optDir) : LpSolver(optDir) {
-            STORM_LOG_WARN_COND(name != "", "Z3 does not support names for solvers");
+            STORM_LOG_WARN_COND(name == "", "Z3 does not support names for solvers");
             z3::config config;
             config.set("model", true);
             context = std::unique_ptr<z3::context>(new z3::context(config));
@@ -120,7 +120,7 @@ namespace storm {
         void Z3LpSolver::addConstraint(std::string const& name, storm::expressions::Expression const& constraint) {            
             STORM_LOG_THROW(constraint.isRelationalExpression(), storm::exceptions::InvalidArgumentException, "Illegal constraint is not a relational expression.");
             STORM_LOG_THROW(constraint.getOperator() != storm::expressions::OperatorType::NotEqual, storm::exceptions::InvalidArgumentException, "Illegal constraint uses inequality operator.");
-            STORM_LOG_WARN_COND(name != "", "Z3 does not support names for constraints");
+            STORM_LOG_WARN_COND(name == "", "Z3 does not support names for constraints");
             solver->add(expressionAdapter->translateExpression(constraint));
         }