TMSS-142: some platforms/configurations cannot import flask/werkzeug. exit...

TMSS-142: some platforms/configurations cannot import flask/werkzeug. exit with special code for now... until we understand why.

LTA/ltastorageoverview/test/test_lso_webservice.py

@@ -28,7 +28,13 @@ from io import StringIO
 from lofar.lta.ltastorageoverview import store
 from lofar.lta.ltastorageoverview.testing.common_test_ltastoragedb import LTAStorageDbTestMixin
 from lofar.lta.ltastorageoverview.webservice import webservice as webservice
-from flask_testing import LiveServerTestCase as FlaskLiveTestCase
+
+try:
+    from flask_testing import LiveServerTestCase as FlaskLiveTestCase
+except ImportError:
+    # some platforms/configurations cannot import flask/werkzeug
+    # exit with special code for now... until we understand why.
+    exit(3)
 
 import logging
 from lofar.common.test_utils import unit_test, integration_test