diff --git a/bumble/avdtp.py b/bumble/avdtp.py
index becafbd..9e9b836 100644
--- a/bumble/avdtp.py
+++ b/bumble/avdtp.py
@@ -314,7 +314,7 @@ class MessageAssembler:
         # Drop empty PDUs sent by remote — accessing pdu[0] below would
         # raise IndexError, propagating up to the L2CAP read loop and
         # tearing down the channel. Same class as #912 (ATT empty PDU).
-        if len(pdu) < 1:
+        if not pdu:
             logger.warning('AVDTP message assembler: empty PDU dropped')
             return
 
diff --git a/tests/avdtp_test.py b/tests/avdtp_test.py
index d5df431..242bdae 100644
--- a/tests/avdtp_test.py
+++ b/tests/avdtp_test.py
@@ -142,7 +142,7 @@ def test_message_assembler_truncated_pdu(pdu: bytes):
     assembler = avdtp.MessageAssembler(callback)
     # Must not raise; nothing should be delivered to callback either.
     assembler.on_pdu(pdu)
-    assert completed == []
+    assert not completed
 
 
 # -----------------------------------------------------------------------------