Fix directory does not exist error in clean builds.
Fix directory does not exist error in clean builds.

chuckdumont/JavascriptAggregator,ddumontatibm/JavascriptAggregator,OpenNTF/JavascriptAggregator,OpenNTF/JavascriptAggregator,ddumontatibm/JavascriptAggregator,ddumontatibm/JavascriptAggregator,chuckdumont/JavascriptAggregator,chuckdumont/JavascriptAggregator,OpenNTF/JavascriptAggregator