Enable report external impacts also for builds that don't contain any buildable files

[dennis-behm]

Enable reporting of external impacts for builds that don't have any buildable files.

dbb-zappbuild/build.groovy

Lines 687 to 698 in f3dfad6

	// Perform analysis and build report of external impacts
	// Prereq: Metadatastore Connection
	if (metadataStore && props.reportExternalImpacts && props.reportExternalImpacts.toBoolean()){
	if (buildSet && changedFiles) {
	println "** Perform analysis and reporting of external impacted files for the build list including changed files."
	reportingUtils.reportExternalImpacts(buildSet.plus(changedFiles))
	}
	else if(buildSet) {
	println "** Perform analysis and reporting of external impacted files for the build list."
	reportingUtils.reportExternalImpacts(buildSet)
	}
	}