[XML] XML parsing exceptions (e.g. WFCException) should cleanly fail the XmlParsing stage rather than go unhandled

[jphelp32]

In the XmlParsing stage, if any parsing error occurs, the exception from the underlying aalto parser goes unhandled and fails the stage. As a result, the exception is always logged at the ERROR log level by akka's logger. I think the better approach would be to catch all parsing exceptions and fail the stage cleanly via failStage(ex), so that the exception is not automatically logged, and consumers of the XmlParsing stage can determine how to react wrt to logging.

[ennru]

Thank you for this suggestion, sounds reasonable.
Please feel free to suggest these changes in a Pull Request.

[ennru]

Fixed with #3003