allow password to be an empty string

Author: bigbes

src/third_party/tp.h

@@ -1274,7 +1274,7 @@ static inline char *
 tp_auth(struct tp *p, const char *salt_base64, const char *user, int ulen, const char *pass, int plen)
 {
 	//char guest = (strncmp(user, "guest", 6) == 0);
-	char nopass = (plen == 0);
+	char nopass = (pass == NULL);
 	int sz = 5 +
 		mp_sizeof_map(2) +
 		mp_sizeof_uint(TP_CODE) +

test/CreateTest.php

@@ -109,6 +109,18 @@ public function test_07_bad_guest_cridentials()
         $c->authenticate('guest', 'guest');
     }
 
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Query error
+     */
+    public function test_07_01_bad_guest_cridentials()
+    {
+        $c = new Tarantool('localhost', self::$port);
+        $c->connect();
+        $this->assertTrue($c->ping());
+        $c->authenticate('guest', '');
+    }
+
     public function test_08_good_cridentials()
     {
         $c = new Tarantool('localhost', self::$port);