TEIIDDES-1715 using item.getStatus().getMessage() instead of item.toString()
TEIIDDES-1714 added null check
TEIIDDES-1662 Transformation Diagram does not show all sources in relational view model
Merge pull request #158 from mdrillin/TEIIDDES-1662

TEIIDDES-1662 Transformation Diagram does not show all sources