Better handling of the case where idlegraph info contains no info cause

there are no nodes allocated (transient situation).

www/aptui/js/adminextend.js

@@ -765,12 +765,18 @@ $(function ()
 
 	var callback = function (status, json) {
 	    console.info("LoadIdleData callback");
-	    if (status < 0) {
-		// Error, show something that indicates we could not get
-		// the idle data.
-		$('#idledata-error').html("Could not get graph data: " +
-					  json.value);
-		$('#idledata-error').removeClass("hidden");
+	    if (status <= 0) {
+		if (status == 0) {
+		    // No data.
+		    $('#idledata-nodata').removeClass("hidden");
+		}
+		else {
+		    // Error, show something that indicates we could not get
+		    // the idle data.
+		    $('#idledata-error').html("Could not get graph data: " +
+					      json.value);
+		    $('#idledata-error').removeClass("hidden");
+		}
 	    }
 	    if (continuation !== undefined) {
 		continuation();

www/aptui/js/idlegraphs.js

@@ -385,10 +385,21 @@ window.ShowIdleGraphs = (function ()
 		    return;
 		}
 		_.each(json.value, function(data, name) {
-		    var idledata = JSON.parse(data);
-		    rawData[name] = idledata;
+		    // No data, skip
+		    if (data == "") {
+			return;
+		    }
+		    rawData[name] = JSON.parse(data);
 		});
 		console.info("raw", rawData);
+		
+		// No data, tell caller and done.
+		if (Object.keys(rawData).length == 0) {
+		    if (C_callback) {
+			C_callback(0, json);
+		    }
+		    return;
+		}
 		var load = ProcessData("load", "avg");
 		var ctrl = ProcessData("ctrl", "avg");
 		var expt = ProcessData("expt", "avg");

www/aptui/js/status.js

@@ -3313,7 +3313,7 @@ $(function ()
 	 * This callback is to let us know if there is any actual data.
 	 */
 	var callback = function (gotdata, ignored) {
-	    if (!gotdata) {
+	    if (gotdata <= 0) {
 		$('#Idlegraphs #nodata').removeClass("hidden");
 	    }
 	};

www/aptui/template/adminextend.html

@@ -209,6 +209,9 @@ pre {
   <div class='col-sm-10 col-sm-offset-1
 	      col-xs-12 col-xs-offset-0'>
     <div class="well well-sm text-danger hidden" id="idledata-error"></div>
+    <div class="well well-sm hidden" id="idledata-nodata">
+	There is insufficient data to graph, please check back later.
+    </div>
     <div class='panel panel-default hidden' id="loadavg-panel-div">
       <div class="panel-heading">
 	<a data-toggle="collapse" id="loadavg-toggle"