No closing button for failed SVN checkout on Mac

Steps to reproduce:

• create an empty svn repository
• check it out via 'New File or Project...' -> 'Import Project' -> 'Subversion Checkout'

Current result:

• as it's empty it succeeds to checkout but fails to open a project file (*.pro, *.cmake, ...)
• all I got is the button for 'Show Details...'
• on Linux you can close this dialog by hitting the X of the dialog, but on Mac the X is disabled

Expected result:

• either having a button to close this dialog (more preferable)
• or having the X of the dialog enabled on Mac as well