fix(benchpress): add filter for when cloud config is not present

Author: jeffbcross

tools/benchpress/src/benchmark.es6

@@ -22,7 +22,9 @@ module.exports = {
 
 function runBenchmark(config, workCallback) {
  var sampleId = nodeUuid.v1();
- var reporters = config.reporters.map(function(Class) {
+ var reporters = config.reporters.filter(function(Class) {
+ return !!Class;
+ }).map(function(Class) {
  return new Class(sampleId, config);
  });
  var scriptMetricIndex = -1;