Added EmptyStringToCollapsedConverter to tooltip.
Merge branch 'Sitrus2' into DUI-HideCodeCopyIcon(noTextInside)
Bread crumbs are fixed
Focus on mouse over cleared.
Unit test is added
Merge branch 'Sitrus2' into DUI-RemoveFocusWhenMouseIsOverOtherMember
Merge pull request #167 from vmoyseenko/DUI-SearchRemoveCategoryNameBreadcrumbs

Bread crumbs are fixed
Merge pull request #158 from vmoyseenko/DUI-HideCodeCopyIcon(noTextInside)

DUI: hide code copy icon(no text inside)
Merge pull request #169 from vmoyseenko/DUI-RemoveFocusWhenMouseIsOverOtherMember

DUI: remove focus when mouse is over other member