HACK: avoid compilation error with TITAN > 6.5.0

it seems TITAN no longer supports 'ifpresent' in certain situations,
see https://www.eclipse.org/forums/index.php/m/1826175/#msg_1826175

Let's make the tests fail if we actually run in those cases, but at
least compile fine and be able to execute all the other tests.

Change-Id: Ia401c2d696979c0062872bca8da62c2ea153427b
1 file changed