Fixed WebDAV missing content handling

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2374 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/filesys/smb/server/repo/ContentNetworkFile.java

@@ -300,7 +300,7 @@ public class ContentNetworkFile extends NetworkFile
             // ensure that the content we are going to read is valid
             content = FileContentReader.getSafeContentReader(
                     (ContentReader) content,
-                    I18NUtil.getMessage("content.content_missing"),
+                    I18NUtil.getMessage(FileContentReader.MSG_MISSING_CONTENT),
                     nodeRef, content);
             
             // Indicate that we only have a read-only channel to the data