Fix undefined array key 'data' exception when trends are empty

Update README.md

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to `laravel-metrics` will be documented in this file
 
+## 2.4.1
+
+- Fix undefined array key 'data' exception when trends are empty
+- Update README.md
+
 ## 2.4.0
 
 - Add HasMetrics trait for models

README.md

@@ -74,14 +74,6 @@ LaravelMetrics::query(
     ->between('2020-05-01', '2022-08-21')
     ->trends();
 
-// generate total count of the orders for the current year
-// by using a custom label column
-LaravelMetrics::query(Order::query())
-    ->count()
-    ->byMonth(12)
-    ->labelColumn('status')
-    ->trends();
-
 // generate total count of the orders for the current year
 // by using a custom label column
 LaravelMetrics::query(Order::query())
@@ -108,7 +100,7 @@ $period = 'day', 'week', 'month' or 'year'
 ```
 
 #### Notes
-Periods are typically defined for the current month and/or year. However, you also have the option to define a specific month or year using dedicated methods. For example:
+Periods are typically defined for the current day, week, month or year. However, you can define a specific value using dedicated methods. For example:
 ```php
 // generate total count of the orders for the year 2023
 //// by using a custom label column

src/LaravelMetrics.php

@@ -400,7 +400,10 @@ public function trends(): array
             ? $this->formatDate($this->trendsData()->toArray())
             : $this->trendsData()->toArray();
 
-        $result = [];
+        $result = [
+            'labels' => [],
+            'data' => []
+        ];
 
         foreach ($trendsData as $data) {
             $result['labels'][] = $data->label;