Admin Raw ID widgets can show broken magnifying glass link

[Ramiro Morales]

This can happen when the related model isn't registered with the same admin site.

Ideally these widgets should behave in a way consistent with the regular non-raw ID admin widgets in this regard.

Example:

# models.py

from django.db import models

class Honeycomb(models.Model):
    location = models.CharField(max_length=20)

class Bee(models.Model):
    honeycomb = models.ForeignKey(Honeycomb)

# admin.py

from django.contrib import admin

import models

class BeeAdmin(admin.ModelAdmin):                                                                                                                                            
    raw_id_fields = ('honeycomb',) 

admin.site.register(models.Bee)

Try to add a Bee instance, in the add view click in the magnifying glass besides the 'Honeycomb' field, this leads to a 404 error.