fixed sublevel objects data initialization

Author: Spamercz

src/Mapping/Settings/Mapping/FieldObject.php

@@ -46,6 +46,10 @@ public function toArray(): array
 				$fields[$field->key()] = $field->toArray();
 				continue;
 			}
+			if ($field instanceof \Spameri\ElasticQuery\Mapping\Settings\Mapping\SubFields) {
+				$fields[$field->key()] = $field->toArray();
+				continue;
+			}
 			if ($field instanceof \Spameri\ElasticQuery\Mapping\Settings\Mapping\NestedObject) {
 				$fields[$field->key()] = $field->toArray();
 				continue;

src/Response/Result/Hit.php

@@ -86,7 +86,7 @@ public function getSubValue($key)
 		if (\str_contains($key, \Spameri\ElasticQuery\Mapping\Settings\Mapping\FieldSeparator::FIELD_SEPARATOR) === TRUE) {
 			$levels = \explode(\Spameri\ElasticQuery\Mapping\Settings\Mapping\FieldSeparator::FIELD_SEPARATOR, $key);
 
-			$value = $this->source[$levels[0]];
+			$value = $this->source[$levels[0]] ?? NULL;
 			unset($levels[0]);
 
 			foreach ($levels as $subKey) {