adaption from comments

README.rst

@@ -98,7 +98,7 @@ need to manually configure this feature:
 * run ``pip install django-select2>=4.3,<5.0``
 * add ``django_select2`` to your ``INSTALLED_APPS``
 * add ``url(r'^select2/', include('django_select2.urls')),`` to your ``urls.py``
-* set ``DJANGOCMS_LINK_SELECT2 = True`` in your ``settings.py``
+* set ``DJANGOCMS_LINK_USE_SELECT2 = True`` in your ``settings.py``
 
 
 Running Tests

aldryn_config.py

@@ -15,7 +15,7 @@ class Form(forms.BaseForm):
     The following settings need to be configured on your project separately
     as we don't want to expose them as aldryn configurations yet:
         DJANGOCMS_LINK_INTRANET_HOSTNAME_PATTERN
-        DJANGOCMS_LINK_SELECT2
+        DJANGOCMS_LINK_USE_SELECT2
     """
 
     def clean(self):

djangocms_link/cms_plugins.py

@@ -1,4 +1,6 @@
 # -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
 from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
 from django.contrib.sites.models import Site

djangocms_link/fields.py

@@ -4,12 +4,12 @@
 
 ENABLE_SELECT2 = getattr(
     settings,
-    'DJANGOCMS_LINK_SELECT2',
+    'DJANGOCMS_LINK_USE_SELECT2',
     False
 )
 
 
-if 'django_select2' in settings.INSTALLED_APPS and ENABLE_SELECT2:
+if ENABLE_SELECT2 and 'django_select2' in settings.INSTALLED_APPS:
     from django_select2.fields import AutoModelSelect2Field
 
     class PageSearchField(AutoModelSelect2Field):
@@ -50,3 +50,7 @@ def prepare_value(self, value):
             if not value:
                 return None
             return super(UserSearchField, self).prepare_value(value)
+else:
+    from cms.forms.fields import PageSelectFormField
+
+    PageSearchField = PageSelectFormField

djangocms_link/forms.py

@@ -6,22 +6,15 @@
 
 from djangocms_attributes_field.widgets import AttributesWidget
 
+from .fields import PageSearchField
 from .models import Link
 
 
 class LinkForm(ModelForm):
-    try:
-        from djangocms_link.fields import PageSearchField
-        internal_link = PageSearchField(
-            label=_('Internal link'),
-            required=False,
-        )
-    except ImportError:
-        from cms.forms.fields import PageSelectFormField
-        internal_link = PageSelectFormField(
-            label=_('Internal link'),
-            required=False,
-        )
+    internal_link = PageSearchField(
+        label=_('Internal link'),
+        required=False,
+    )
 
     def for_site(self, site):
         # override the internal_link fields queryset to contains just pages for

djangocms_link/models.py

@@ -3,6 +3,8 @@
 Enables the user to add a "Link" plugin that displays a link
 using the HTML <a> tag.
 """
+from __future__ import unicode_literals
+
 from django.db import models
 from django.conf import settings
 from django.core.exceptions import ValidationError
@@ -63,7 +65,6 @@ class AbstractLink(CMSPlugin):
     external_link = models.URLField(
         verbose_name=_('External link'),
         blank=True,
-        null=True,
         max_length=2040,
         validators=url_validators,
         help_text=_('Provide a valid url to an external website.'),
@@ -88,13 +89,11 @@ class AbstractLink(CMSPlugin):
     mailto = models.EmailField(
         verbose_name=_('Email address'),
         blank=True,
-        null=True,
         max_length=255,
     )
     phone = models.CharField(
         verbose_name=_('Phone'),
         blank=True,
-        null=True,
         max_length=255,
     )
     # advanced options
@@ -129,7 +128,7 @@ def __str__(self):
     def get_short_description(self):
         if self.name:
             return '{} ({})'.format(self.name, self.get_link())
-        return self.get_link()
+        return self.get_link() or ugettext('<link is missing>')
 
     def get_link(self):
         if self.phone:
@@ -142,11 +141,8 @@ def get_link(self):
             link = self.internal_link.get_absolute_url()
         else:
             link = ''
-        if (self.external_link or self.internal_link_id or not link) and self.anchor:
+        if (not self.phone and not self.mailto) and self.anchor:
             link += '#{}'.format(self.anchor)
-        # link can be empty if a page attached to it has been removed
-        if link == '':
-            link = '<link is missing>'
 
         return link