diff --git a/django/contrib/admindocs/utils.py b/django/contrib/admindocs/utils.py
index 7347a421805..bc0a3bca547 100644
--- a/django/contrib/admindocs/utils.py
+++ b/django/contrib/admindocs/utils.py
@@ -110,8 +110,6 @@ def create_reference_role(rolename, urlbase):
     def _role(name, rawtext, text, lineno, inliner, options=None, content=None):
         if options is None:
             options = {}
-        if content is None:
-            content = []
         node = docutils.nodes.reference(
             rawtext,
             text,
@@ -128,8 +126,6 @@ def create_reference_role(rolename, urlbase):
 def default_reference_role(name, rawtext, text, lineno, inliner, options=None, content=None):
     if options is None:
         options = {}
-    if content is None:
-        content = []
     context = inliner.document.settings.default_reference_context
     node = docutils.nodes.reference(
         rawtext,
diff --git a/django/contrib/contenttypes/models.py b/django/contrib/contenttypes/models.py
index ad2e0bc904b..0ff0933fafe 100644
--- a/django/contrib/contenttypes/models.py
+++ b/django/contrib/contenttypes/models.py
@@ -86,7 +86,6 @@ class ContentTypeManager(models.Manager):
                 model__in=needed_models
             )
             for ct in cts:
-                model = ct.model_class()
                 opts_models = needed_opts.pop(ct.model_class()._meta, [])
                 for model in opts_models:
                     results[model] = ct
diff --git a/django/contrib/staticfiles/management/commands/collectstatic.py b/django/contrib/staticfiles/management/commands/collectstatic.py
index 6e11b984a72..7f5bbbf39bf 100644
--- a/django/contrib/staticfiles/management/commands/collectstatic.py
+++ b/django/contrib/staticfiles/management/commands/collectstatic.py
@@ -271,7 +271,6 @@ class Command(BaseCommand):
                         # unmodified files.
                         can_skip_unmodified_files = not (self.symlink ^ os.path.islink(full_path))
                     else:
-                        full_path = None
                         # In remote storages, skipping is only based on the
                         # modified times since symlinks aren't relevant.
                         can_skip_unmodified_files = True