fix bug, when .data field is empty

rossengeorgiev · rossengeorgiev · commit ccd1210dd76b · 2013-03-27T14:41:29.000+02:00
diff --git a/cache.manifest b/cache.manifest
@@ -1,5 +1,5 @@
 CACHE MANIFEST
-# version 128
+# version 129
 
 # gogole maps files
 http://maps.google.com/maps/api/js?v=3.10&sensor=false&key=AIzaSyCOqkcNey4CCyG4X0X5qxHAhCgD8g5DwXg
diff --git a/index.html b/index.html
@@ -3,10 +3,10 @@
     <head>
         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
         <title>habitat mobile tracker</title>
-        <meta name="description" content="A cross-device tracking application for high altitude ballooning with habitat" />
+        <meta name="description" content="A cross-device web application for tracking high altitude balloons" />
         <meta name="author" content="Rossen Georgiev" />
         <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"/>
-        <meta name="apple-mobile-web-app-title" content="Mobile Tracker">
+        <meta name="apple-mobile-web-app-title" content="Habitat Tracker">
         <meta name="apple-mobile-web-app-capable" content="yes" />
         <meta name="apple-mobile-web-app-status-bar-style" content="black" />
         <link rel="apple-touch-icon" sizes="144x144" href="img/apple-touch-icon.png" />
diff --git a/js/tracker.js b/js/tracker.js
@@ -865,6 +865,7 @@ function graphAddLastPosition(idx) {
 
     // the rest of the series is from the data field
     var json = $.parseJSON(new_data.data);
+    if(!json) return;
 
     $.each(json, function(k, v) {
         if(isNaN(v) || v=="") return;        // only take data that is numerical
