[Custom Map] Fixed error if logbook is empty

application/controllers/Map.php

@@ -69,7 +69,12 @@ class Map extends CI_Controller {
 		$CI =& get_instance();
 		$CI->load->model('logbooks_model');
 		$result = $CI->logbooks_model->logbook($this->session->userdata('active_station_logbook'))->result();
+		
+		if ($result) {
 			$logbook_name = $result[0]->logbook_name;
+		} else {
+			$logbook_name = '';
+		}
 
         // load the view
         $data['logbook_name'] = $logbook_name;
@@ -111,6 +116,7 @@ class Map extends CI_Controller {
 
 		echo "{\"markers\": [";
 		$count = 1;
+		if ($qsos) {
 			foreach ($qsos->result() as $row) {
 				//print_r($row);
 				if($row->COL_GRIDSQUARE != null) {
@@ -144,6 +150,7 @@ class Map extends CI_Controller {
 						$count++;
 					}
 				}
+		}
 
 		}
 		echo "]";

application/models/Logbook_model.php

@@ -1074,6 +1074,10 @@ class Logbook_model extends CI_Model {
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
+    if (!$logbooks_locations_array) {
+      return null;
+    }
+
       $this->db->where("COL_TIME_ON BETWEEN '".$start."' AND '".$end."'");
       $this->db->where_in("station_id", $logbooks_locations_array);