Fix for empty parameter name

ora/string_util_pkg.pkb

@@ -345,7 +345,6 @@ as
   l_temp_str     t_max_pl_varchar2;
   l_begin_pos    pls_integer;
   l_end_pos      pls_integer;
-
 begin
 
 
@@ -359,9 +358,12 @@ begin
   Who     Date        Description
   ------  ----------  -------------------------------------
   MBR     16.05.2007  Created
+  MBR     24.09.2015  If parameter name not specified (null), then return null
   
   */
 
+  if p_param_name is not null then
+
     -- get the starting position of the param name
     l_begin_pos:=instr(p_param_string, p_param_name || p_value_separator);
 
@@ -389,6 +391,8 @@ begin
 
     end if;
 
+  end if;
+
   return l_returnvalue;
 
 end get_param_value_from_list;