diff --git a/scripts/generate-options.py b/scripts/generate-options.py
index 75a25ae..652f89a 100644
--- a/scripts/generate-options.py
+++ b/scripts/generate-options.py
@@ -33,27 +33,29 @@ groups = ["mailserver.loginAccounts",
           "mailserver.borgbackup"]
 
 def render_option_value(opt, attr):
-  if attr in opt:
-      if isinstance(opt[attr], dict) and '_type' in opt[attr]:
-          if opt[attr]['_type'] == 'literalExpression':
-              if '\n' in opt[attr]['text']:
-                  res = '\n```nix\n' + opt[attr]['text'].rstrip('\n') + '\n```'
-              else:
-                  res = '```{}```'.format(opt[attr]['text'])
-          elif opt[attr]['_type'] == 'literalMD':
-              res = opt[attr]['text']
-      else:
-          s = str(opt[attr])
-          if s == "":
-              res = '`""`'
-          elif '\n' in s:
-              res = '\n```\n' + s.rstrip('\n') + '\n```'
-          else:
-              res = '```{}```'.format(s)
-      res = '- ' + attr + ': ' + res
-  else:
-      res = ""
-  return res
+    if attr not in opt:
+        return ""
+
+    if isinstance(opt[attr], dict) and '_type' in opt[attr]:
+        if opt[attr]['_type'] == 'literalExpression':
+            if '\n' in opt[attr]['text']:
+                res = '\n```nix\n' + opt[attr]['text'].rstrip('\n') + '\n```'
+            else:
+                res = '```{}```'.format(opt[attr]['text'])
+        elif opt[attr]['_type'] == 'literalMD':
+            res = opt[attr]['text']
+        else:
+            assert RuntimeError(f"Unhandled option type {opt[attr]["_type"]}")
+    else:
+        s = str(opt[attr])
+        if s == "":
+            res = '`""`'
+        elif '\n' in s:
+            res = '\n```\n' + s.rstrip('\n') + '\n```'
+        else:
+            res = '```{}```'.format(s)
+
+    return '- ' + attr + ': ' + res  # type: ignore
 
 def print_option(opt):
     if isinstance(opt['description'], dict) and '_type' in opt['description']: # mdDoc