fix(transport): when path is empty string don't add an extra "/"

Fixes: #17

peasant/client/transport.py

@@ -50,7 +50,7 @@ def concat_url(url: str, path: str = None, **kwargs: dict) -> str:
                    f"Not {type(query_string)}")
             raise TypeError(err)
         path = f"{path}?{query_string}"
-    if path is not None and path != "/":
+    if path is not None and path != "" and path != "/":
         if path.startswith("/"):
             path = path[1:]
         url = f"{url}/{path}"

tests/transport_test.py

@@ -25,6 +25,11 @@ def test_concat_url(self):
         expected_url = "http://bastion"
         self.assertEqual(expected_url, url)
 
+        bastion_address = fix_address("http://bastion/")
+        url = concat_url(bastion_address, "")
+        expected_url = "http://bastion"
+        self.assertEqual(expected_url, url)
+
         url = concat_url(bastion_address, path="resource")
         expected_url = "http://bastion/resource"
         self.assertEqual(expected_url, url)