Fixed crashing `get` if notification doesn't exist

src/android/LocalNotification.java

@@ -36,6 +36,7 @@ import org.json.JSONObject;
 
 import java.lang.reflect.Method;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 import de.appplant.cordova.plugin.notification.Manager;
@@ -234,6 +235,9 @@ public class LocalNotification extends CordovaPlugin {
             Notification notification =
                     getNotificationMgr().update(id, update, TriggerReceiver.class);
 
+            if (notification == null)
+                continue;
+
             fireEvent("update", notification);
         }
     }
@@ -251,11 +255,12 @@ public class LocalNotification extends CordovaPlugin {
             Notification notification =
                     getNotificationMgr().cancel(id);
 
-            if (notification != null) {
+            if (notification == null)
+                continue;
+
             fireEvent("cancel", notification);
         }
     }
-    }
 
     /**
      * Cancel all scheduled notifications.
@@ -278,11 +283,12 @@ public class LocalNotification extends CordovaPlugin {
             Notification notification =
                     getNotificationMgr().clear(id);
 
-            if (notification != null) {
+            if (notification == null)
+                continue;
+
             fireEvent("clear", notification);
         }
     }
-    }
 
     /**
      * Clear all triggered notifications without canceling them.
@@ -469,11 +475,20 @@ public class LocalNotification extends CordovaPlugin {
                              CallbackContext command) {
 
         JSONArray ids = new JSONArray().put(id);
+        PluginResult result;
 
-        JSONObject options =
-                getNotificationMgr().getOptionsBy(type, toList(ids)).get(0);
+        List<JSONObject> options =
+                getNotificationMgr().getOptionsBy(type, toList(ids));
 
-        command.success(options);
+        if (options.isEmpty()) {
+            // Status.NO_RESULT led to no callback invocation :(
+            // Status.OK        led to no NPE and crash
+            result = new PluginResult(PluginResult.Status.NO_RESULT);
+        } else {
+            result = new PluginResult(PluginResult.Status.OK, options.get(0));
+        }
+
+        command.sendPluginResult(result);
     }
 
     /**