Fix regression in last release

We accidentally changed behavior of get method on documents by no longer
allowing fetching the entire document by passing in null

Author: sunkan

src/BasicDocument.php

@@ -30,8 +30,11 @@ public function getId(): string
 		return $this->id;
 	}
 
-	public function has(string $path): bool
+	public function has(?string $path): bool
 	{
+		if (!$path) {
+			return true;
+		}
 		try {
 			$this->reference($path)->hasValue();
 			return true;

src/DocumentCollection.php

@@ -51,7 +51,7 @@ public function getId(): string
 	public function has(?string $path): bool
 	{
 		if (!$path) {
-			return false;
+			return true;
 		}
 		foreach ($this->documents as $document) {
 			if ($document->has($path)) {
@@ -63,9 +63,6 @@ public function has(?string $path): bool
 
 	public function get(string $path = null): mixed
 	{
-		if (!$path) {
-			return false;
-		}
 		foreach ($this->documents as $document) {
 			if ($document->has($path)) {
 				return $document->get($path);