Tasks without due dates shouldn't be added to calendar

astrid/plugin-src/com/todoroo/astrid/gcal/GCalControlSet.java

@@ -135,6 +135,9 @@ public class GCalControlSet extends PopupControlSet {
     @SuppressWarnings("nls")
     @Override
     protected String writeToModelAfterInitialized(Task task) {
+        if (!task.hasDueDate())
+            return null;
+
         boolean gcalCreateEventEnabled = Preferences.getStringValue(R.string.gcal_p_default) != null &&
                                         !Preferences.getStringValue(R.string.gcal_p_default).equals("-1");
         if ((gcalCreateEventEnabled || calendarSelector.getSelectedItemPosition() != 0) &&

astrid/plugin-src/com/todoroo/astrid/gcal/GCalHelper.java

@@ -45,10 +45,12 @@ public class GCalHelper {
     }
 
     public static void createTaskEventIfEnabled(Task t) {
+        if (!t.hasDueDate())
+            return;
         createTaskEventIfEnabled(t, true);
     }
 
-    public static void createTaskEventIfEnabled(Task t, boolean deleteEventIfExists) {
+    private static void createTaskEventIfEnabled(Task t, boolean deleteEventIfExists) {
         boolean gcalCreateEventEnabled = Preferences.getStringValue(R.string.gcal_p_default) != null
             && !Preferences.getStringValue(R.string.gcal_p_default).equals("-1"); //$NON-NLS-1$
         if (gcalCreateEventEnabled) {

astrid/src/com/todoroo/astrid/ui/QuickAddBar.java

@@ -358,7 +358,7 @@ public class QuickAddBar extends LinearLayout {
 
     private static void addToCalendar(Task task, String title) {
         boolean gcalCreateEventEnabled = Preferences.getStringValue(R.string.gcal_p_default) != null
-                && !Preferences.getStringValue(R.string.gcal_p_default).equals("-1"); //$NON-NLS-1$
+                && !Preferences.getStringValue(R.string.gcal_p_default).equals("-1") && task.hasDueDate(); //$NON-NLS-1$
 
         if (!TextUtils.isEmpty(title) && gcalCreateEventEnabled && TextUtils.isEmpty(task.getValue(Task.CALENDAR_URI))) {
             Uri calendarUri = GCalHelper.createTaskEvent(task,