Check if OneToOneField is None in Django

Question

I have two models like this:

class Type1Profile(models.Model):
    user = models.OneToOneField(User, unique=True)
    ...


class Type2Profile(models.Model):
    user = models.OneToOneField(User, unique=True)
    ...

I need to do something if the user has Type1 or Type2 profile:

if request.user.type1profile != None:
    # do something
elif request.user.type2profile != None:
    # do something else
else:
    # do something else

But, for users that don't have either type1 or type2 profiles, executing code like that produces the following error:

Type1Profile matching query does not exist.

How can I check the type of profile a user has?

Thanks