backend/accounts: skip unsupported coins when adding hidden accounts

With a BB02 BTC-only version, the log showed attempts to add LTC
accounts, which were then skipped as unsupported. We can abort earlier
in this case, which prevents the log from showing 'automatically
created hidden account' for LTC accounts when LTC is not supported.

Author: benma

backend/accounts.go

@@ -1496,6 +1496,14 @@ func (backend *Backend) maybeAddHiddenUnusedAccounts() {
 		coinCodes = []coinpkg.Code{coinpkg.CodeBTC, coinpkg.CodeLTC}
 	}
 	for _, coinCode := range coinCodes {
+		coin, err := backend.Coin(coinCode)
+		if err != nil {
+			backend.log.Errorf("could not find coin %s", coinCode)
+			continue
+		}
+		if !backend.keystore.SupportsCoin(coin) {
+			continue
+		}
 		var newAccountCode *accountsTypes.Code
 		err = backend.config.ModifyAccountsConfig(func(cfg *config.AccountsConfig) error {
 			newAccountCode = do(cfg, coinCode)
@@ -1509,11 +1517,6 @@ func (backend *Backend) maybeAddHiddenUnusedAccounts() {
 			continue
 		}
 		if newAccountCode != nil {
-			coin, err := backend.Coin(coinCode)
-			if err != nil {
-				backend.log.Errorf("could not find coin %s", coinCode)
-				continue
-			}
 			accountConfig := backend.config.AccountsConfig().Lookup(*newAccountCode)
 			if accountConfig == nil {
 				backend.log.Errorf("could not find newly persisted account %s", *newAccountCode)