Do not start suggestion loader if host isn't attached.

Change-Id: I1ab1de8f0bea6c66d8415e06aedcc7cbc6baf89c
Fixes: 68759380
Test: robotests

src/com/android/settings/dashboard/DashboardSummary.java

@@ -17,6 +17,7 @@
 package com.android.settings.dashboard;
 
 import android.app.Activity;
+import android.app.LoaderManager;
 import android.content.Context;
 import android.os.AsyncTask;
 import android.os.Bundle;
@@ -95,6 +96,14 @@ public class DashboardSummary extends InstrumentedFragment
         }
     }
 
+    @Override
+    public LoaderManager getLoaderManager() {
+        if (!isAdded()) {
+            return null;
+        }
+        return super.getLoaderManager();
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         long startTime = System.currentTimeMillis();