check if env variable is set correctly

Author: tuvshuud

testcontainers/core/container.py

@@ -80,8 +80,9 @@ def __del__(self):
     def get_container_host_ip(self) -> str:
         # https://github.com/testcontainers/testcontainers-go/blob/dd76d1e39c654433a3d80429690d07abcec04424/docker.go#L644
         # if os env TC_HOST is set, use it
-        if os.environ.get('TC_HOST') is not None:
-            return os.environ.get('TC_HOST')
+        host = os.environ.get('TC_HOST')
+        if host:
+            return host
 
         # infer from docker host
         url = self.get_docker_client().host()