Skip test_autobahn if python_on_whales is missing

Docker (and therefore python_on_whales) is not portable and would be missing on e.g. BSD systems. Don't fail tests in that case.

Author: AMDmi3

tests/autobahn/test_autobahn.py

@@ -6,7 +6,12 @@
 
 import pytest
 from pytest import TempPathFactory
-from python_on_whales import DockerException, docker
+
+if TYPE_CHECKING:
+    from python_on_whales import DockerException, docker
+else:
+    DockerException = pytest.importorskip("python_on_whales.DockerException")
+    docker = pytest.importorskip("python_on_whales.docker")
 
 
 @pytest.fixture(scope="session")