Fixed broken Plugin::config() method

CHANGELOG.md

@@ -18,6 +18,7 @@
     * Fixed `Flex Pages` not updating empty content on save [#2890](https://github.com/getgrav/grav/issues/2890)
     * Fixed creating new Flex User with file storage
     * Fixed saving new `Flex Object` with custom key
+    * Fixed broken `Plugin::config()` method
 
 # v1.7.0-rc.8
 ## 03/19/2020

system/src/Grav/Common/Plugin.php

@@ -91,10 +91,7 @@ class Plugin implements EventSubscriberInterface, \ArrayAccess
      */
     public function config()
     {
-        if (is_array($this->config)) {
-            return $this->config["plugins.{$this->name}"];
-        }
-
+        return null !== $this->config ? $this->config["plugins.{$this->name}"] : [];
     }
 
     /**

system/src/Grav/Framework/Flex/FlexIndex.php

@@ -70,11 +70,17 @@ class FlexIndex extends ObjectIndex implements FlexCollectionInterface, FlexInde
     }
 
     /**
+     * You can define indexes for fast lookup.
+     *
+     * Primary key: $meta['key']
+     * Secondary keys:  $meta['my_field']
+     *
      * @param array $meta
      * @param array $data
      */
     public static function updateObjectMeta(array &$meta, array $data)
     {
+        // For backwards compatibility, no need to call this method when you override this method.
         static::updateIndexData($meta, $data);
     }