Do not output compilation results that are made of whitespace characters

src/main.cpp

@@ -71,7 +71,11 @@ int main(int argc, char* argv[]) {
             const auto&& result = currentFuture.get();
             const bool is_exception = result.second.has_value();
             if (not is_exception) {
-                if (printResult) cout << result.first << '\n';
+                if (printResult && !(result.first.empty() || all_of(result.first.begin(), result.first.end(), [](const char& character){
+                    return isspace(character);
+                }))) {
+                    cout << result.first << '\n';
+                }
             } else {
                 cout << "Compilation of " << result.first << " has failed with the following error:\n" << result.second.value().what() << '\n';
             }