Sheet: display an error in console when a cyclic dependency is detected

src/Mod/Spreadsheet/App/Sheet.cpp

@@ -1005,8 +1005,9 @@ DocumentObjectExecReturn *Sheet::execute(void)
             std::list<Vertex> make_order;
             try {
                 boost::topological_sort(graph, std::front_inserter(make_order));
-            } catch (std::exception&) {
+            } catch (std::exception&) { //TODO: evaluate using a more specific exception (not_a_dag)
                 // Cycle detected; flag all with errors
+                Base::Console().Error("Cyclic dependency detected in spreadsheet : %s\n", *pcNameInDocument);
                 std::ostringstream ss;
                 ss << "Cyclic dependency";
                 int count = 0;