more graph work

models/temperature.js

@@ -3,7 +3,7 @@ var mongoose = require('mongoose');
 var temperatureSchema = new mongoose.Schema({
 	temperature: Number,
 	humidity: Number,
-	location: String,
+	location: {type : String, default : "Undefined Location"},
 	updated: {type: Date, default: Date.now}
 });