Handle already existing wallet file on recover

Related to cdde41e162

scripts/joinmarket-qt.py

@@ -1460,6 +1460,7 @@ class JMMainWindow(QMainWindow):
         self.close()
 
     def recoverWallet(self):
+        try:
             success = wallet_generate_recover_bip39("recover", "wallets",
                                                     "wallet.jmdat",
                                                     callbacks=(None, self.seedEntry,
@@ -1471,6 +1472,10 @@ class JMMainWindow(QMainWindow):
                            mbtype='warn',
                            title="Error")
                 return
+        except Exception as e:
+            JMQtMessageBox(self, e.args[0], title="Error", mbtype="warn")
+            return
+
         JMQtMessageBox(self, 'Wallet saved to ' + self.walletname,
                                    title="Wallet created")
         self.initWallet(seed=self.walletname, restart_cb=self.restartWithMsg)