tests/test_docker: handle docker.errors.DockerException

This exception is raised when the docker socket is not available.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>

Author: jluebbe

tests/test_docker.py

@@ -17,8 +17,11 @@ def check_external_progs_present():
     """Determine if host machine has a usable docker daemon"""
     try:
         import docker
-        dock = docker.from_env()
-        dock.info()
+        try:
+            dock = docker.from_env()
+            dock.info()
+        except docker.errors.DockerException:
+            return False
     except OSError:
         return False
     return True