Remove useless call

You cannot throw and return.

Author: Grégoire Paris

tests/DataProvider/ChainCollectionDataProviderTest.php

@@ -33,7 +33,7 @@ public function testGetCollection()
         $dummy2->setName('Parks');
 
         $firstDataProvider = $this->prophesize(CollectionDataProviderInterface::class);
-        $firstDataProvider->getCollection(Dummy::class, null)->willReturn([$dummy, $dummy2])->willThrow(ResourceClassNotSupportedException::class);
+        $firstDataProvider->getCollection(Dummy::class, null)->willThrow(ResourceClassNotSupportedException::class);
 
         $secondDataProvider = $this->prophesize(CollectionDataProviderInterface::class);
         $secondDataProvider->getCollection(Dummy::class, null)->willReturn([$dummy, $dummy2]);