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When NBXplorer is not ready/synced, LN is used as payment option - (LNURL should not activate if the node is down)

See original GitHub issue

Describe the bug

If an order is created via the Greenfield API (and NBXplorer is not synced) LN is used as the only payment checkout option, but doesn’t shown an QR code (and it should not have been an option to begin with).

Reproduce

Setup BTCPayServer using Docker
Set BTCPAYGEN_CRYPTO1 to btc and enable LN
Start BTCPayServer and wait until it’s ready (but before NBXplorer is ready)
Create an order via the Greenfield API (might work from the interface as well).

Expected behavior

I expected some kind of error or information screen that would warn the developer/user that BTCPayServer is not yet ready to process payments.

Screenshots

Starting	Payment page

Your BTCPay Environment:

BTCPay Server Version: v1.4.7.0
Deployment Method: Docker
Browser: Chrome

Setup Parameters

-------SETUP-----------
Parameters passed:
BTCPAY_PROTOCOL:https
BTCPAY_HOST:btcpay.example.com
BTCPAY_ADDITIONAL_HOSTS:
REVERSEPROXY_HTTP_PORT:80
REVERSEPROXY_HTTPS_PORT:443
REVERSEPROXY_DEFAULT_HOST:none
BTCPAY_ENABLE_SSH:false
NBITCOIN_NETWORK:mainnet
LIGHTNING_ALIAS:example.com
BTCPAYGEN_CRYPTO1:btc
BTCPAYGEN_CRYPTO2:
BTCPAYGEN_CRYPTO3:
BTCPAYGEN_CRYPTO4:
BTCPAYGEN_CRYPTO5:
BTCPAYGEN_CRYPTO6:
BTCPAYGEN_CRYPTO7:
BTCPAYGEN_CRYPTO8:
BTCPAYGEN_CRYPTO9:
BTCPAYGEN_REVERSEPROXY:nginx
BTCPAYGEN_LIGHTNING:lnd
BTCPAYGEN_ADDITIONAL_FRAGMENTS:opt-add-tor;opt-lnd-autopilot
----------------------
Additional exported variables:
BTCPAY_DOCKER_COMPOSE=/server/BTCPayServer/btcpayserver-docker/Generated/docker-compose.generated.yml
BTCPAY_BASE_DIRECTORY=/server/BTCPayServer
BTCPAY_ENV_FILE=/server/BTCPayServer/.env
BTCPAYGEN_OLD_PREGEN=false
BTCPAY_SSHAUTHORIZEDKEYS=/datadir/host_authorized_keys
BTCPAY_HOST_SSHAUTHORIZEDKEYS:/server/.ssh/authorized_keys
BTCPAY_CRYPTOS:btc
BTCPAY_ANNOUNCEABLE_HOST:btcpay.example.com