var formattedRevisions = {};
for (var repositoryId in revisions) {
var currentRevision = revisions[repositoryId][0];
- var previousRevision = previousRevisions ? previousRevisions[repositoryId][0] : null;
+ var previousRevision = previousRevisions && previousRevisions[repositoryId] ? previousRevisions[repositoryId][0] : null;
var formatttedRevision = Measurement.formatRevisionRange(currentRevision, previousRevision);
formattedRevisions[repositoryId] = formatttedRevision;
}