From c498d1ada7e83c0ebec9fd0723565d085e2e3e4b Mon Sep 17 00:00:00 2001
From: Enric Tobella <enric.tobella@dixmit.com>
Date: Tue, 11 Mar 2025 10:19:09 +0100
Subject: [PATCH] Do not force err

Otherwise, a KeyError is raised if err has not been defined
---
 fsspec/registry.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fsspec/registry.py b/fsspec/registry.py
index 59be4db7b..05be65736 100644
--- a/fsspec/registry.py
+++ b/fsspec/registry.py
@@ -248,7 +248,7 @@ def get_filesystem_class(protocol):
         try:
             register_implementation(protocol, _import_class(bit["class"]))
         except ImportError as e:
-            raise ImportError(bit["err"]) from e
+            raise ImportError(bit.get("err")) from e
     cls = registry[protocol]
     if getattr(cls, "protocol", None) in ("abstract", None):
         cls.protocol = protocol