More superfluous output on Ubuntu

[simonharris]

nb: fine on Mac.

% PL-Unit: pa1 ............................................. passed 0.011 sec
% PL-Unit: meta_tests .
ERROR: [plunit_assert] Asserted true but got false for: 1=2
.
ERROR: [plunit_assert] Asserted true but got false for: false
ERROR: [plunit_assert] Expected message not found: 'my hovercraft is full of eels'
ERROR: [plunit_assert] Actual message was: 'Asserted true but got false for: false'
ERROR: [plunit_assert] Expected message not found: 'my hovercraft is full of eels'
ERROR: [plunit_assert] Actual message was: 'Asserted true but got false for: false'
. passed 0.000 sec
% All 48 tests passed