Fix bug in clear method introduced in last change

Author: JeroenDeDauw

src/Entity/Item.php

@@ -233,7 +233,7 @@ public function isEmpty() {
 	public function clear() {
 		$this->fingerprint = Fingerprint::newEmpty();
 		$this->siteLinks = new SiteLinkList();
-		$this->statements = array();
+		$this->statements = new StatementList();
 	}
 
 	/**

tests/unit/Entity/ItemTest.php

@@ -813,4 +813,11 @@ public function testSetStatements() {
 		$this->assertEquals( new StatementList(), $item->getStatements() );
 	}
 
+	public function testGetStatementsReturnsCorrectTypeAfterClear() {
+		$item = Item::newEmpty();
+		$item->clear();
+
+		$this->assertEquals( new StatementList(), $item->getStatements() );
+	}
+
 }