Fix linter

src/handlers/auth_handler.cr

@@ -84,8 +84,8 @@ class AuthHandler < Kemal::Handler
       end
       if should_reject
         env.response.status_code = 403
-        message = "HTTP 403: You are not authorized to visit #{env.request.path}"
-        send_error_page
+        send_error_page "HTTP 403: You are not authorized to visit " \
+                        "#{env.request.path}"
         return
       end
     end

src/util/web.cr

@@ -1,5 +1,6 @@
 # Web related helper functions/macros
 
+# This macro defines `is_admin` when used
 macro check_admin_access
   is_admin = false
   # The token (if exists) takes precedence over the default user option.
@@ -28,7 +29,8 @@ macro layout(name)
   end
 end
 
-macro send_error_page
+macro send_error_page(msg)
+  message = {{msg}}
   base_url = Config.current.base_url
   check_admin_access
   page = "Error"