Add a unit test for the scenario described in phpredis#379

Author: michael-grunder

tests/TestRedis.php

@@ -2282,6 +2282,8 @@ public function testHashes() {
 	$this->assertFalse(array(123 => 'x') === $this->redis->hMget('h', array(123)));
 	$this->assertTrue(array(123 => FALSE) === $this->redis->hMget('h', array(123)));
 
+    // Test with an array populated with things we can't use as keys
+    $this->assertTrue($this->redis->hmget('h', Array(false,NULL,false)) === FALSE);
 
 	// hmget/hmset with numeric fields
 	$this->redis->del('h');