Remove two redundant empty lines.

PEP8 suggests to use two empty lines to separate functions, not three.

tests/conftest.py

@@ -33,7 +33,6 @@ def leak_detector(request):
     request.addfinalizer(ensure_clean_request_context)
 
 
-
 @pytest.fixture(params=(True, False))
 def limit_loader(request, monkeypatch):
     """Patch pkgutil.get_loader to give loader without get_filename or archive.

tests/test_signals.py

@@ -19,7 +19,6 @@ except ImportError:
 import flask
 
 
-
 pytestmark = pytest.mark.skipif(
     blinker is None,
     reason='Signals require the blinker library.'