Had to change a bit how ExprError is used, to prevent having to turn unit
tests into ingergation tests, adding 5 seconds to run time.
Change-Id: Id4e158f3a4418d320b1c0bdac834ebbba03762af
The following sniffs are failing and were disabled:
* MediaWiki.Commenting.FunctionComment.MissingParamName
* MediaWiki.Commenting.FunctionComment.MissingParamTag
* MediaWiki.FunctionComment.Missing.Public
* MediaWiki.WhiteSpace.SpaceBeforeSingleLineComment.NewLineComment
Change-Id: Iaa65f1987144baffd480d082538547fc9cf2c15b