Add conference center required message

When trying to add a conference room and a conference center doesn't exist then show a message to the user that the conference center is required.

app/conference_centers/app_languages.php

@@ -702,6 +702,32 @@ $text['message-minimum_pin_length']['zh-cn'] = "最低生活年限:";
 $text['message-minimum_pin_length']['ja-jp'] = "必要な最低PINの長さ:";
 $text['message-minimum_pin_length']['ko-kr'] = "요구되는 최소한도 PIN 길이:";
 
+$text['message-conference_center_required']['en-us'] = "Conference Center Required";
+$text['message-conference_center_required']['en-gb'] = "Conference Center Required";
+$text['message-conference_center_required']['ar-eg'] = "مركز المؤتمرات مطلوب";
+$text['message-conference_center_required']['de-at'] = "Konferenzzentrum erforderlich";
+$text['message-conference_center_required']['de-ch'] = "Konferenzzentrum erforderlich";
+$text['message-conference_center_required']['de-de'] = "Konferenzzentrum erforderlich";
+$text['message-conference_center_required']['el-gr'] = "Απαιτείται Κέντρο Συνεδρίων";
+$text['message-conference_center_required']['es-cl'] = "Centro de conferencias requerido";
+$text['message-conference_center_required']['es-mx'] = "Centro de conferencias requerido";
+$text['message-conference_center_required']['fr-ca'] = "Centre de conférences requis";
+$text['message-conference_center_required']['fr-fr'] = "Centre de conférences requis";
+$text['message-conference_center_required']['he-il'] = "מרכז כנסים נדרש";
+$text['message-conference_center_required']['it-it'] = "Centro conferenze richiesto";
+$text['message-conference_center_required']['ka-ge'] = "კონფერენციების ცენტრი საჭიროა";
+$text['message-conference_center_required']['nl-nl'] = "Conferentiecentrum vereist";
+$text['message-conference_center_required']['pl-pl'] = "Wymagane jest centrum konferencyjne";
+$text['message-conference_center_required']['pt-br'] = "Centro de conferências obrigatório";
+$text['message-conference_center_required']['pt-pt'] = "Centro de conferências obrigatório";
+$text['message-conference_center_required']['ro-ro'] = "Centru de conferințe necesar";
+$text['message-conference_center_required']['ru-ru'] = "Требуется конференц-зал";
+$text['message-conference_center_required']['sv-se'] = "Konferenscenter krävs";
+$text['message-conference_center_required']['uk-ua'] = "Потрібен конференц-зал";
+$text['message-conference_center_required']['zh-cn'] = "需要会议中心";
+$text['message-conference_center_required']['ja-jp'] = "会議センターが必要です";
+$text['message-conference_center_required']['ko-kr'] = "회의 센터가 필요합니다";
+
 $text['label-wait_moderator']['en-us'] = "Secure";
 $text['label-wait_moderator']['en-gb'] = "Secure";
 $text['label-wait_moderator']['ar-eg'] = "يؤمن";

app/conference_centers/conference_room_edit.php

@@ -121,6 +121,13 @@
 	$conference_centers = $database->select($sql, $parameters, 'all');
 	unset($sql, $parameters);
 
+//conference center to be setup first before adding a room
+	if (empty($conference_centers)) {
+		message::add($text['message-conference_center_required'], 'negative');
+		header("Location: conference_rooms.php");
+		exit;
+	}
+
 //get the conference profiles
 	$sql = "select * ";
 	$sql .= "from v_conference_profiles ";
@@ -196,6 +203,7 @@
 	unset($sql, $parameters);
 
 //generate the pin numbers
+	$pin_length = (empty($pin_length)) ? '9' : $pin_length;
 	if (empty($moderator_pin)) {
 		$moderator_pin = get_conference_pin($pin_length, $conference_room_uuid ?? null);
 	}

app/conference_centers/conference_rooms.php

@@ -160,10 +160,7 @@
 //get conference array
 	$switch_cmd = "conference xml_list";
 	$esl = event_socket::create();
-	if (!$esl->is_connected()) {
+	if ($esl->is_connected()) {
-		trigger_error('Unable to connect to FreeSWITCH', E_USER_WARNING);
-	}
-	else {
 		$xml_str = trim(event_socket::api($switch_cmd));
 		try {
 			$xml = new SimpleXMLElement($xml_str, true);