bench: Allow skip benchmark

Co-authored-by: Martin Ankerl <Martin.Ankerl@gmail.com>

src/bench/bench.cpp

@@ -70,8 +70,11 @@ void benchmark::BenchRunner::RunAll(const Args& args)
             }
             std::cout << bench.complexityBigO() << std::endl;
         }
+
+        if (!bench.results().empty()) {
             benchmarkResults.push_back(bench.results().back());
         }
+    }
 
     GenerateTemplateResults(benchmarkResults, args.output_csv, "# Benchmark, evals, iterations, total, min, max, median\n"
                                                                "{{#result}}{{name}}, {{epochs}}, {{average(iterations)}}, {{sumProduct(iterations, elapsed)}}, {{minimum(elapsed)}}, {{maximum(elapsed)}}, {{median(elapsed)}}\n"