Add in the analogous test for tags that is given for properties a few
lines below.
 
        message = notmuch_messages_get (messages);
 
-       if (dump_tags_message (notmuch, message, output_format, output,
+       if ((include & DUMP_INCLUDE_TAGS) &&
+           dump_tags_message (notmuch, message, output_format, output,
                               &buffer, &buffer_size))
            return EXIT_FAILURE;
 
 
 test_expect_equal_file PROPERTIES OUTPUT
 
 test_begin_subtest "dump _only_ message properties"
-test_subtest_known_broken
 cat <<EOF > EXPECTED
 #notmuch-dump batch-tag:3 properties
 #= 4EFC743A.3060609@april.org fancy%20key%20with%20%c3%a1cc%c3%a8nts=import%20value%20with%20= testkey1=alice testkey1=bob testkey1=testvalue1 testkey1=testvalue2 testkey3=alice3 testkey3=bob3 testkey3=testvalue3