improve missing docker exception

core/docker.py

@@ -15,6 +15,6 @@ def resolve_docker_ip(docker_name):
            docker_name]
     try:
         output = subprocess.check_output(cmd)
-    except subprocess.CalledProcessError as e:
+    except (subprocess.CalledProcessError, FileNotFoundError) as e:
         raise RuntimeError("An error occured while retrieving IP for docker %s: %s", docker_name, e)
     return output.decode('utf-8').strip('\n').replace("'", "")