1 files changed, 5 insertions, 5 deletions
diff --git a/bottle.py b/bottle.py
index f5ff19b..326c7df 100755
--- a/bottle.py
+++ b/bottle.py
@@ -452,6 +452,11 @@ class Bottle(object):
         Support: False, str, unicode, dict, HTTPResponse, HTTPError, file-like,
         iterable of strings and iterable of unicodes
         """
+        # Filtered types (recursive, because they may return anything)
+        for testtype, filterfunc in self.castfilter:
+            if isinstance(out, testtype):
+                return self._cast(filterfunc(out))
+
         # Empty output is done here
         if not out:
             response.headers['Content-Length'] = 0
@@ -474,11 +479,6 @@ class Bottle(object):
             out.apply(response)
             return self._cast(out.output)
 
-        # Filtered types (recursive, because they may return anything)
-        for testtype, filterfunc in self.castfilter:
-            if isinstance(out, testtype):
-                return self._cast(filterfunc(out))
-
         # Cast Files into iterables
         if hasattr(out, 'read') and 'wsgi.file_wrapper' in request.environ:
             out = request.environ.get('wsgi.file_wrapper',