dup.uniqueIdToBugInstanceMap.clear();
	public SortedBugCollection createEmptyCollectionWithMetadata() {		SortedBugCollection dup = new SortedBugCollection((ProjectStats) projectStats.clone(), comparator);			dup.errorList.addAll(this.errorList);		dup.missingClassSet.addAll(this.missingClassSet);		dup.summaryHTML = this.summaryHTML;		dup.classFeatureSetMap.putAll(this.classFeatureSetMap);		dup.sequence = this.sequence;		dup.timestamp = this.timestamp;		dup.releaseName = this.releaseName;		for (AppVersion appVersion : appVersionList) {			dup.appVersionList.add((AppVersion) appVersion.clone());		}		dup.uniqueIdToBugInstanceMap.clear();		return dup;	}