LPD-43352 Handle orphan references in content

Author: adolfopa

modules/apps/dynamic-data-mapping/dynamic-data-mapping-service/src/main/java/com/liferay/dynamic/data/mapping/internal/upgrade/v5_6_1/DDMFieldAttributeUpgradeProcess.java

@@ -127,6 +127,10 @@ private DLFileEntry _getDLFileEntry(long companyId, Matcher matcher)
 				_fileEntryFriendlyURLResolver.resolveFriendlyURL(
 					group.getGroupId(), friendlyURL);
 
+			if (fileEntry == null) {
+				return null;
+			}
+
 			return (DLFileEntry)fileEntry.getModel();
 		}
 
@@ -185,6 +189,14 @@ private long _getDLFileEntryId(long companyId, String src)
 			try {
 				DLFileEntry dlFileEntry = _getDLFileEntry(companyId, matcher);
 
+				if (dlFileEntry == null) {
+					if (_log.isWarnEnabled()) {
+						_log.warn("Missing file entry for URL " + src);
+					}
+
+					return 0;
+				}
+
 				return dlFileEntry.getFileEntryId();
 			}
 			catch (PortalException portalException) {