Unbreak non-format-setuptools-extra-installed jsonschema.

Revert the changes to the docs requirements.

fqdn is *not* a doc requirement, it's part of the package's
requirements, but only when format validation is installed.

The docs builds were failing because they do not install the
format extra.

This was actually a (known bad) CI gap, that we didn't run the tests
against all the configurations (i.e. against jsonschema installed with
no setuptools extras, say).

Fixed in the previous commit, so now we can run this.

1 files changed, 15 insertions, 12 deletions

diff --git a/jsonschema/_format.py b/jsonschema/_format.py
index 36bacab..65e453e 100644
--- a/jsonschema/_format.py
+++ b/jsonschema/_format.py
@@ -3,8 +3,6 @@ import re
 import socket
 import struct
 
-from fqdn import FQDN
-
 from jsonschema.exceptions import FormatError
 
 
@@ -211,16 +209,21 @@ if hasattr(socket, "inet_pton"):
         return socket.inet_pton(socket.AF_INET6, instance)
 
 
-@_checks_drafts(
-    draft3="host-name",
-    draft4="hostname",
-    draft6="hostname",
-    draft7="hostname",
-)
-def is_host_name(instance):
-    if not isinstance(instance, str):
-        return True
-    return FQDN(instance).is_valid
+try:
+    from fqdn import FQDN
+except ImportError:
+    pass
+else:
+    @_checks_drafts(
+        draft3="host-name",
+        draft4="hostname",
+        draft6="hostname",
+        draft7="hostname",
+    )
+    def is_host_name(instance):
+        if not isinstance(instance, str):
+            return True
+        return FQDN(instance).is_valid
 
 
 try: