[OMCProcessDocker*] fix unused variable (#342)

Co-authored-by: Adeel Asghar <adeel.asghar@liu.se>

Author: syntron

OMPython/OMCSession.py

@@ -643,7 +643,7 @@ def _docker_process_get(self, docker_cid: str) -> Optional[DummyPopen]:
             raise NotImplementedError("Docker not supported on win32!")
 
         docker_process = None
-        for idx in range(0, 40):
+        for _ in range(0, 40):
             dockerTop = subprocess.check_output(["docker", "top", docker_cid]).decode().strip()
             docker_process = None
             for line in dockerTop.split("\n"):
@@ -846,7 +846,7 @@ def _docker_omc_start(self) -> Tuple[subprocess.Popen, DummyPopen, str]:
             raise OMCSessionException(f"Invalid content for docker container ID file path: {docker_cid_file}")
 
         docker_cid = None
-        for idx in range(0, 40):
+        for _ in range(0, 40):
             try:
                 with open(file=docker_cid_file, mode="r", encoding="utf-8") as fh:
                     docker_cid = fh.read().strip()