use contrib.staticfiles.finders if available and in DEBUG mode

django_static/templatetags/django_static.py

@@ -632,6 +632,16 @@ def _find_filepath_in_roots(filename):
         filepath = _filename2filepath(filename, root)
         if os.path.isfile(filepath):
             return filepath, root
+    # havent found it in DJANGO_STATIC_MEDIA_ROOTS look for apps' files if we're
+    #  in DEBUG mode
+    if settings.DEBUG:
+        try:
+            from django.contrib.staticfiles import finders
+            absolute_path = finders.find(filename)
+            root, filepath = os.path.split(absolute_path)
+            return absolute_path, root
+        except ImportError:
+            pass
     return None, None
 
 def _filename2filepath(filename, media_root):