Fix debug_ldap_client tracebacks (#81)

Ensure debug_ldap_client does not fail with a traceback when failing to
get the krb5 context or default ccache. A failure in those steps should
be reported in the output.

changelogs/fragments/debug_ldap_client-failure.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- debug_ldap_client - handle failures when attempting to get the krb5 context and default CCache rather than fail with a traceback

plugins/action/debug_ldap_client.py

@@ -52,7 +52,9 @@ def run(
                 "dns": dns_info,
                 "kerberos": kerb_info,
                 "packages": {
-                    "dnspython": self._import_lib("dns.resolver", package_name="dnspython"),
+                    "dnspython": self._import_lib(
+                        "dns.resolver", package_name="dnspython"
+                    ),
                     "dpapi_ng": self._import_lib("dpapi_ng", package_name="dpapi-ng"),
                     "krb5": self._import_lib("krb5"),
                     "pyspnego": self._import_lib("spnego", package_name="pyspnego"),
@@ -77,8 +79,6 @@ def _get_kerberos_info(self) -> t.Dict[str, t.Any]:
             ctx = krb5.init_context()
         except Exception:
             res["exception"] = traceback.format_exc()
-
-        if not ctx:
             return res
 
         try:
@@ -106,8 +106,6 @@ def _get_kerberos_cc_info(
             default_cc = krb5.cc_default(ctx)
         except Exception:
             res["exception"] = traceback.format_exc()
-
-        if not default_cc:
             return res
 
         try:
@@ -154,7 +152,9 @@ def _get_server_lookup_info(
                     }
                 )
 
-            highest_record = next(iter(sorted(records, key=lambda k: (k["priority"], -k["weight"]))), None)
+            highest_record = next(
+                iter(sorted(records, key=lambda k: (k["priority"], -k["weight"]))), None
+            )
             if highest_record:
                 res["default_server"] = highest_record["target"].rstrip(".")
                 res["default_port"] = highest_record["port"]