Catch and log any errors from backup_status() calls in status_checks.py

Duplicity seems to have pushed a broken release [1]. This doesn't fix
that, but it unbreaks the status page (where the actual error can be
read off).

Side note: my editor seems to have stripped trailing whitespace on a
couple of lines. Keeping it in the patch because I'm lazy

[1] https://discourse.mailinabox.email/t/duplicity-error-nov-2025/16061/2

management/backup.py

@@ -17,6 +17,11 @@ from utils import load_environment, shell, wait_for_service
 import operator
 
 def backup_status(env):
+	"""
+	TODO: Document what the return value actually is.
+
+	Will raise an exception if the call to the duplicity binary fails.
+	"""
 	# If backups are disabled, return no status.
 	config = get_backup_config(env)
 	if config["target"] == "off":
@@ -65,7 +70,7 @@ def backup_status(env):
 		get_duplicity_target_url(config)
 		],
 		get_duplicity_env_vars(env),
-		trap=True)
+		trap=True, capture_stderr=True)
 	if code != 0:
 		# Command failed. This is likely due to an improperly configured remote
 		# destination for the backups or the last backup job terminated unexpectedly.

management/status_checks.py

@@ -275,7 +275,11 @@ def check_backup(rounded_values, env, output):
 		output.print_ok("Backups are enabled")
 
 	# Get the age of the most recent backup
+	try:
 		backup_stat = backup_status(env)
+	except Exception as e:
+		output.print_error(f"Failed to obtain backup status: {e}")
+		return
 
 	backups = backup_stat.get("backups", {})
 	if backups and len(backups) > 0: