Fix double bidding and connection reset problem.

Close #165

basicswap/ui/page_offers.py

@@ -659,20 +659,13 @@ def page_offer(self, url_split, post_string):
                     extra_options=extra_options,
                 ).hex()
 
-                sent_bid_id = swap_client.postBid(
-                    offer_id,
-                    amount_from,
-                    addr_send_from=addr_from,
-                    extra_options=extra_options,
-                ).hex()
-
                 if debugind > -1:
                     swap_client.setBidDebugInd(bytes.fromhex(sent_bid_id), debugind)
 
                 self.send_response(302)
                 self.send_header("Location", f"/bid/{sent_bid_id}")
-                self.end_headers
-                return bytes
+                self.end_headers()
+                return bytes()
 
             except Exception as ex:
                 if self.server.swap_client.debug is True: