[OMCSession*] some additional cleanup (mypy / flake8)

* remove not needed variable definitions
* fix if condition for bool

Author: syntron

OMPython/OMCSession.py

@@ -1012,7 +1012,7 @@ def sendExpression(self, command: str, parsed: bool = True) -> Any:
                 raise OMCSessionException(f"OMC error occurred for 'sendExpression({command}, {parsed}):\n"
                                           f"{msg_long_str}")
 
-        if parsed is False:
+        if not parsed:
             return result
 
         try:
@@ -1238,7 +1238,6 @@ def _docker_process_get(self, docker_cid: str) -> Optional[DockerPopen]:
         if sys.platform == 'win32':
             raise NotImplementedError("Docker not supported on win32!")
 
-        docker_process = None
         loop = self._timeout_loop(timestep=0.2)
         while next(loop):
             docker_top = subprocess.check_output(["docker", "top", docker_cid]).decode().strip()
@@ -1630,7 +1629,6 @@ def _omc_process_get(self) -> subprocess.Popen:
         return omc_process
 
     def _omc_port_get(self) -> str:
-        omc_portfile_path: Optional[pathlib.Path] = None
         port = None
 
         # See if the omc server is running