Properly handle setters now that there is a default value of null with unset acl/labels

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/Db/Board.php

@@ -74,18 +74,14 @@ class Board extends RelationalEntity {
 	 * @param Label[] $labels
 	 */
 	public function setLabels($labels) {
-		foreach ($labels as $l) {
-			$this->labels[] = $l;
-		}
+		$this->labels = $labels;
 	}
 
 	/**
 	 * @param Acl[] $acl
 	 */
 	public function setAcl($acl) {
-		foreach ($acl as $a) {
-			$this->acl[] = $a;
-		}
+		$this->acl = $acl;
 	}
 
 	public function getETag() {

tests/unit/Db/BoardMapperTest.php

@@ -161,6 +161,7 @@ class BoardMapperTest extends MapperTestUtility {
 		$actual = $this->boardMapper->find($this->boards[0]->getId(), true, false);
 		/** @var Board $expected */
 		$expected = $this->boards[0];
+		$expected->setLabels([]);
 		$this->assertEquals($expected->getLabels(), $actual->getLabels());
 	}