Bug 454718 - XDebug variables with 'null' value are shown as
'uninitialized'

Change-Id: I4187260b0333f29389570c7b04069613bf024022
Signed-off-by: Bartlomiej Laczkowski <bartlomiej.l@zend.com>
Merge "Bug 454718 - XDebug variables with 'null' value are shown as 'uninitialized'"