mUzimaCore automatically saves error data being validated

mUzimaCore automatically saves error data every time a user clicks on the "Validate" button, which is unexpected. The required workflow is that a user updates a payload and then validates, such that if the validation is successful, the user is then allowed to save it. Saving should not be allowed to prevent saving invalid data.

How to reproduce:

• Step 1: Open an error item for editing, make some changes and click on validate.
• Step 2: Reopen the error record and look at the record. At this point, changes made in step 1 will be reflected in the error record, even though you did not explicitly save.