Possible NPE in MountService

At

if(previewHstSiteNodeForMount == null || isPreview()) {
log.info("There is no preview version '{}-preview' for mount '{}' or the mount is already a preview" +
"by itself. Cannot create automatic PREVIEW HstSite " +
"for this Mount. The mount '"mountPoint"' will be used.", mountPoint, mount.getValueProvider().getPath());
previewHstSite = hstSite;
previewCanonicalContentPath = canonicalContentPath;
previewContentPath = contentPath;
} else {
try {
previewHstSite = new HstSiteService(previewHstSiteNodeForMount, this, hstManager);