Refactor reaction vector initialization in TrilinosBlockBuilderAndSolver to handle unsupported linear algebra libraries with an error message

Author: loumalouomega

applications/TrilinosApplication/custom_strategies/builder_and_solvers/trilinos_block_builder_and_solver.h

@@ -767,12 +767,11 @@ class TrilinosBlockBuilderAndSolver
             TSystemVectorPointerType pNewReactionsVector = TSparseSpace::CreateEmptyVectorPointer();
             if constexpr (TSparseSpace::LinearAlgebraLibrary() == TrilinosLinearAlgebraLibrary::EPETRA) {
                 pNewReactionsVector = TSystemVectorPointerType(new TSystemVectorType(rpDx->Map()));
-        } else {
-                pNewReactionsVector = TSparseSpace::CreateVector(rpDx->getMap());
+            } else {
+                KRATOS_ERROR << "ResizeAndInitializeVectors not implemented for this linear algebra library" << std::endl;
             }
             BaseType::mpReactionsVector.swap(pNewReactionsVector);
-        }
-        else {
+        } else {
             if (TSparseSpace::Size1(*rpA) == 0 ||
                 TSparseSpace::Size1(*rpA) != BaseType::mEquationSystemSize ||
                 TSparseSpace::Size2(*rpA) != BaseType::mEquationSystemSize) {