Merge pull request magento#113 from magento/MQE-977

MQE-977: ErrorLogger expects source to be a log paramater

Author: imeron2433

src/Magento/FunctionalTestingFramework/Extension/ErrorLogger.php

@@ -50,7 +50,7 @@ public function logErrors($webDriver, $stepEvent)
  //Types available should be "server", "browser", "driver". Only care about browser at the moment.
  $browserLogEntries = $webDriver->manage()->getLog("browser");
  foreach ($browserLogEntries as $entry) {
- if ($entry["source"] === "javascript") {
+ if (array_key_exists("source", $entry) && $entry["source"] === "javascript") {
  $this->logError("javascript", $stepEvent, $entry);
  }
  }