Fixed #36182 -- Returned "?" if all parameters are removed in querystring template tag.

Thank you to David Feeley for the report and Natalia Bidart for the review.

1 files changed, 7 insertions, 7 deletions

diff --git a/django/template/defaulttags.py b/django/template/defaulttags.py
index ae74679ec6..1152452081 100644
--- a/django/template/defaulttags.py
+++ b/django/template/defaulttags.py
@@ -1194,18 +1194,18 @@ def querystring(context, query_dict=None, **kwargs):
     """
     if query_dict is None:
         query_dict = context.request.GET
-    query_dict = query_dict.copy()
+    params = query_dict.copy()
     for key, value in kwargs.items():
         if value is None:
-            if key in query_dict:
-                del query_dict[key]
+            if key in params:
+                del params[key]
         elif isinstance(value, Iterable) and not isinstance(value, str):
-            query_dict.setlist(key, value)
+            params.setlist(key, value)
         else:
-            query_dict[key] = value
-    if not query_dict:
+            params[key] = value
+    if not params and not query_dict:
         return ""
-    query_string = query_dict.urlencode()
+    query_string = params.urlencode()
     return f"?{query_string}"