Constants wrongfully marked as not graphpresreving. Bugfix for bug reported by Nils Jansen.

src/storm/storage/prism/Program.cpp

@@ -247,12 +247,6 @@ namespace storm {
                 }
             }
             
-            // Then check the formulas.
-            for (auto const& formula : this->getFormulas()) {
-                if (formula.getExpression().containsVariable(undefinedConstantVariables)) {
-                    return false;
-                }
-            }
 
             // Proceed by checking each of the modules.
             for (auto const& module : this->getModules()) {