Bot: fix AttributeError for commands which lack root_aliases

Even if the `command` decorators are patched, there are still some other
internal things that need to be patched. For example, the default help
command subclasses the original `Command` type. It's more maintainable
to exclude root alias support for these objects than to try to patch
everything.

1 files changed, 2 insertions, 2 deletions

diff --git a/bot/bot.py b/bot/bot.py
index 34254d8e8..d25074fd9 100644
--- a/bot/bot.py
+++ b/bot/bot.py
@@ -262,7 +262,7 @@ class Bot(commands.Bot):
             for subcommand in command.commands:
                 self._add_root_aliases(subcommand)
 
-        for alias in command.root_aliases:
+        for alias in getattr(command, "root_aliases", ()):
             if alias in self.all_commands:
                 raise commands.CommandRegistrationError(alias, alias_conflict=True)
 
@@ -274,5 +274,5 @@ class Bot(commands.Bot):
             for subcommand in command.commands:
                 self._remove_root_aliases(subcommand)
 
-        for alias in command.root_aliases:
+        for alias in getattr(command, "root_aliases", ()):
             self.all_commands.pop(alias, None)