add py26 test and skip __init__ coverage

pyotrs/__init__.py

@@ -15,9 +15,10 @@ from .lib import Ticket  # noqa
 
 # Set default logging handler to avoid "No handler found" warnings.
 import logging
-try:  # Python 2.7+
+# Python 2.7+
+try:  # pragma: no cover
     from logging import NullHandler
-except ImportError:
+except ImportError:  # pragma: no cover
     class NullHandler(logging.Handler):
         def emit(self, record):
             pass