Adjust Key types and Table class after phpstan and unit tests analysis

Signed-off-by: William Desportes <williamdes@wdes.fr>

Author: williamdes

src/Components/Key.php

@@ -77,9 +77,9 @@ class Key extends Component
     public $expr = null;
 
     /**
-     * The options of this key.
+     * The options of this key or null if none where found.
      *
-     * @var OptionsArray
+     * @var OptionsArray|null
      */
     public $options;
 

src/Utils/Table.php

@@ -42,6 +42,9 @@ public static function getForeignKeys($statement)
 
             $columns = array();
             foreach ($field->key->columns as $column) {
+                if (! isset($column['name'])) {
+                    continue;
+                }
                 $columns[] = $column['name'];
             }