Fix crash with StreamSocket and TLS (#4535)

Co-authored-by: Guillaume Valadon <guillaume.valadon@gitguardian.com>
Co-authored-by: gpotter2 <10530980+gpotter2@users.noreply.github.com>

scapy/layers/tls/session.py

@@ -1167,6 +1167,8 @@ def tcp_reassemble(cls, data, metadata, session):
             length = struct.unpack("!H", data[3:5])[0] + 5
             if len(data) >= length:
                 # get the underlayer as it is used to populate tls_session
+                if "original" not in metadata:
+                    return cls(data)
                 underlayer = metadata["original"][TCP].copy()
                 underlayer.remove_payload()
                 # eventually get the tls_session now for TLS.dispatch_hook