- fixed order to reduce workload if null returned

java/org/slub/rosetta/dps/repository/plugin/storage/nfs/SLUBStoragePlugin.java

@@ -396,10 +396,10 @@ public class SLUBStoragePlugin extends AbstractStorageHandler {
     protected String getFilePathInDescIfExists(StoredEntityMetaData storedEntityMetadata)
     {
         log.info("SLUBStoragePlugin.getFilePathInDescIfExists()");
-        String tmpFilePath = getTempStorageDirectory(false) + "destPath";
         if (storedEntityMetadata.getIePid() == null) {
             return null;
         }
+        String tmpFilePath = getTempStorageDirectory(false) + "destPath";
         String existsDescPath = StorageUtil.readDestPathFromTmpFile(storedEntityMetadata.getIePid(), tmpFilePath, storedEntityMetadata.getEntityPid());
         log.debug("SLUBStoragePlugin.getFilePathInDescIfExists() existsDescPath='" + existsDescPath + "'");
         return existsDescPath;