Merge pull request #130 from crazedr0m/1.0

* fix hstore key exist check

Author: AlexeyDsov

main/Base/Hstore.class.php

@@ -85,7 +85,7 @@ public function drop($key)
 
 		public function isExists($key)
 		{
-			return isset($this->properties[$key]);
+			return key_exists($key, $this->properties);
 		}
 
 		/**

test/main/HstoreTest.class.php

@@ -16,11 +16,15 @@ public function testRun()
 			$array = array(
 				'1' => 'qqer',
 				'f' => 'qs34$9&)_@+#qer',
+				'null' => null
 			);
 
 			$test = Hstore::make($array);
 			$test2= Hstore::create($test->toString());
 
 			$this->assertEquals($test->toString(), $test2->toString());
+
+			$this->assertTrue($test->isExists('null'));
+			$this->assertFalse($test->isExists('notExist'));
 		}
 	}