Add default values to array_merge (#1184)

Author: netpok

src/Generator.php

@@ -54,9 +54,9 @@ public function __construct(
         // Find the drivers to add to the extra/interfaces
         $this->detectDrivers();
 
-        $this->extra = array_merge($this->extra, $this->config->get('ide-helper.extra'));
-        $this->magic = array_merge($this->magic, $this->config->get('ide-helper.magic'));
-        $this->interfaces = array_merge($this->interfaces, $this->config->get('ide-helper.interfaces'));
+        $this->extra = array_merge($this->extra, $this->config->get('ide-helper.extra'), []);
+        $this->magic = array_merge($this->magic, $this->config->get('ide-helper.magic'), []);
+        $this->interfaces = array_merge($this->interfaces, $this->config->get('ide-helper.interfaces'), []);
         // Make all interface classes absolute
         foreach ($this->interfaces as &$interface) {
             $interface = '\\' . ltrim($interface, '\\');