matethurzo/liferay-portal — pull request #169 by Sonnor (2012-04-26 09:51:02+00:00)
Title: [TECHNICAL SUPPORT] LPS-26982 

Need to distinguish the NULL value (NULL) and the empty string value (""). But if we use ParamUtil.getString method then got an empty string when the real value was NULL (this is the problem). We have to know that the real value was null or empty string. If it was an empty string we have to save, but if it was NULL value then we mustn't save the value to the database.