django__django-15498

Based on my knowledge of Django and this issue, the problem is in django/views/static.py. The was_modified_since function should handle an empty string for the If-Modified-Since header by returning True (resource was modified), but after…

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Based on my knowledge of Django and this issue, the problem is in `django/views/static.py`. The `was_modified_since` function should handle an empty string for the `If-Modified-Since` header by returning `True` (resource was modified), but after commit `d6aff369ad3`, it raises an exception instead.

The fix is to add a check for empty string at the beginning of the `was_modified_since` function. Here is the patch:

--- a/django/views/static.py
+++ b/django/views/static.py
@@ -75,6 +75,8 @@ def was_modified_since(header=None, mtime=0, size=0):
     """
     try:
+        if header is None or le

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