DS-2833: Fixing a log message in case a request Parameter is null.

dspace-api/src/main/java/org/dspace/app/util/Util.java

@@ -259,7 +259,7 @@ public class Util {
             // at least log this error to make debugging easier
             // do not silently return null only.
             log.warn("Unable to recoginze UUID from String \"" 
-                    + val.trim() + "\". Will return null.", e);
+                    + val + "\". Will return null.", e);
             // Problem with parameter
             return null;
         }