swapd: checkme, fixed pattern match to avoid failing unwrap

treating as if the bug is on the pop unwrap, since the expect is checked

2022-07-17T13:13:23.6366705Z [2022-07-17T13:13:23Z DEBUG microservices::esb::controller] syncer<(Monero,Local)> -> swap<0x8478…a469>: syncer_event(TransactionConfirmations(TransactionConfirmations { id: TaskId(1
1), block: [178, 67, 8, 101, 245, 54, 2, 17, 91, 42, 117, 121, 49, 102, 1, 0, 114, 0, 189, 96, 58, 32, 16, 52, 132, 231, 198, 83, 77, 42, 7, 187], confirmations: Some(20), tx: [] }))
2022-07-17T13:13:23.6368099Z thread 'main' panicked at 'Checked above', src/swapd/runtime.rs:1239:30
2022-07-17T13:13:23.6368705Z note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

src/swapd/runtime.rs

@@ -1223,10 +1223,15 @@ impl Runtime {
                     Event::TransactionConfirmations(TransactionConfirmations {
                         confirmations: Some(confirmations),
                         ..
-                    }) if self.state.b_buy_sig()
-                        || (self.state.a_refundsig() && self.state.a_xmr_locked())
-                            && *confirmations >= self.temporal_safety.sweep_monero_thr
-                            && self.pending_requests().contains_key(&source) =>
+                    }) if (self.state.b_buy_sig()
+                        || (self.state.a_refundsig() && self.state.a_xmr_locked()))
+                        && *confirmations >= self.temporal_safety.sweep_monero_thr
+                        && self.pending_requests().contains_key(&source)
+                        && self
+                            .pending_requests()
+                            .get(&source)
+                            .map(|r| r.len() > 0)
+                            .unwrap_or(false) =>
                     {
                         let PendingRequest {
                             source,