XmlValidatorManager should not throw an exception if the validator dir does not exist.
Update XmlValidatorManagerTest to reflect the modifications in XmlValidatorManager.
Merge pull request #345 from Victsm/validator-plugin

XmlValidatorManager should not throw an exception if the validator dir d...
Fix the issue with XmlValidatorManager passing wrong project archive file path to the validators - issue #351
Merge pull request #352 from Victsm/validator-plugin

Fix the issue with XmlValidatorManager passing wrong project archive fil...