Fixes #20. By implementing checks before reading server files.

init/msm

@@ -1564,7 +1564,7 @@ command_server_whitelist_remove() {
 # Displays a list of whitelisted players for an individual server
 # $1: The server ID
 command_server_whitelist_list() {
-	# TODO: Protect against no whitelist file
+	if [ -f "${server_whitelist[$1]}" ]; then
 		local players="$(cat "${server_whitelist[$1]}")"
 
 		if [ -z "$players" ]; then
@@ -1572,6 +1572,9 @@ command_server_whitelist_list() {
 		else
 			echo "$players"
 		fi
+	else
+		echo "No players are whitelisted."
+	fi
 }
 
 # Adds player names to a server's ban list
@@ -1657,10 +1660,16 @@ command_server_blacklist_ip_remove() {
 # Displays a server's banned player names and ip addresses
 # $1: The server ID
 command_server_blacklist_list() {
-	# TODO: Protect against non-existent files
+	local players
+	local ips
 
-	local players="$(cat "${server_banned_players[$1]}")"
-	local ips="$(cat "${server_banned_ips[$1]}")"
+	if [ -f "${server_banned_players[$1]}" ]; then
+		players="$(cat "${server_banned_players[$1]}")"
+	fi
+
+	if [ -f "${server_banned_ips[$1]}" ]; then
+		ips="$(cat "${server_banned_ips[$1]}")"
+	fi
 
 	if [[ -z "$players" && -z "$ips" ]]; then
 		echo "The blacklist is empty."