Show message if there's no bus on its way.

modules/map.php

@@ -3,6 +3,7 @@
 
 <?php
 function ShowMap($coords){
+    if(count($coords)>0){
 ?>
     <div id="mymap" style="width:300px;height:300px;overflow:hidden;"></div>
     <script>
@@ -51,5 +52,11 @@ echo '['. $coords[$i][1] . ',' . $coords[$i][0] . ']];';
         });
     </script>
 <?php
+    }else{
+?>
+    <span style="display:inline-block" class="alert alert-danger" role="alert">No bus on its way yet. <a href="javascript:history.back()">Go back?</a></span>
+
+<?php
+    }
 }
 ?>