[BUG] The incorrect configuration of the node-key-file caused the node to panic during runtime.

[sdjasj]

Seid version
name: sei
server_name:
version: v4.1.7-evm-devnet
commit: 6e0c934
build_tags: netgo ledger,
go: go version go1.22.4 linux/amd64
build_deps:

• cosmossdk.io/errors@v1.0.0
• filippo.io/edwards25519@v1.0.0-rc.1
• github.com/99designs/keyring@v1.2.1

Chain ID
Local 4-docker-node chain

Describe the bug
I changed the value of node-key-file in the config.toml file to a path that does not contain the node key file. After restarting the node, it panicked during runtime with the error: panic: runtime error: invalid memory address or nil pointer dereference.

To Reproduce
Steps to reproduce the behavior:

1. Changed the value of node-key-file in the config.toml file to a path that does not contain the node key file
2. Restart the node
3. panic: runtime error: invalid memory address or nil pointer dereference occur

Expected behavior
SEI should properly handle exceptions related to the node-key-file and provide users with a friendly error message, rather than panicking at runtime.

Screenshots
Here is the code snippet with the bug:

Additional context
Here is the panic log.
seid-3.log

Here is the config file

proxy-app = "tcp://127.0.0.1:26658"
moniker = "sei-node-0"
mode = "validator"
db-dir = "data"
log-level = "info"
log-format = "plain"
node-key-file = "config/genesis.json"
abci = "socket"
filter-peers = false

[priv-validator]
key-file = "config/priv_validator_key.json"
state-file = "data/priv_validator_state.json"
laddr = ""
client-certificate-file = ""
client-key-file = ""
root-ca-file = ""

[rpc]
laddr = "tcp://0.0.0.0:26657"
cors-allowed-origins = []
cors-allowed-methods = [ "HEAD", "GET", "POST",]
cors-allowed-headers = [ "Origin", "Accept", "Content-Type", "X-Requested-With", "X-Server-Time",]
unsafe = false
max-open-connections = 900
max-subscription-clients = 100
max-subscriptions-per-client = 5
experimental-disable-websocket = false
event-log-window-size = "30s"
event-log-max-items = 0
timeout-broadcast-tx-commit = "10s"
max-body-bytes = 1000000
max-header-bytes = 1048576
tls-cert-file = ""
tls-key-file = ""
pprof-laddr = "localhost:6060"

[p2p]
queue-type = "priority"
laddr = "tcp://0.0.0.0:26656"
external-address = ""
bootstrap-peers = ""
persistent-peers = "bc6492eb3874b3ba9de6f31c69debafc16712751@192.168.10.10:26656,0410b4c2854451c3570413fa85ee50a074b9d807@192.168.10.12:26656,8b3fdd73de6cd9a0b05863a9946101f6a77e4ce4@192.168.10.11:26656"
upnp = false
max-connections = 200
max-incoming-connection-attempts = 100
pex = true
private-peer-ids = ""
allow-duplicate-ip = false
handshake-timeout = "20s"
dial-timeout = "3s"
flush-throttle-timeout = "10ms"
max-packet-msg-payload-size = 102400
send-rate = 204800000
recv-rate = 204800000

[mempool]
broadcast = true
size = 5000
max-txs-bytes = 107374182400
cache-size = 50000
keep-invalid-txs-in-cache = false
max-tx-bytes = 20485760
max-batch-bytes = 0
ttl-duration = "0s"
ttl-num-blocks = 0

[statesync]
enable = false
rpc-servers = "bc6492eb3874b3ba9de6f31c69debafc16712751@192.168.10.10:26656,0410b4c2854451c3570413fa85ee50a074b9d807@192.168.10.12:26656,8b3fdd73de6cd9a0b05863a9946101f6a77e4ce4@192.168.10.11:26656"
trust-height = 0
trust-hash = ""
trust-period = "168h0m0s"
discovery-time = "15s"
temp-dir = ""
chunk-request-timeout = "15s"
fetchers = "4"

[consensus]
wal-file = "data/cs.wal/wal"
unsafe-propose-timeout-override = "3s"
unsafe-propose-timeout-delta-override = "500ms"
unsafe-vote-timeout-override = "50ms"
unsafe-vote-timeout-delta-override = "500ms"
unsafe-commit-timeout-override = "50ms"
double-sign-check-height = 0
unsafe-bypass-commit-timeout-override = false
create-empty-blocks = true
create-empty-blocks-interval = "0s"
peer-gossip-sleep-duration = "100ms"
peer-query-maj23-sleep-duration = "2s"
gossip-tx-key-only = true

[tx-index]
indexer = [ "kv",]
psql-conn = ""

[instrumentation]
prometheus = true
prometheus-listen-addr = ":26660"
max-open-connections = 3
namespace = "tendermint"