Empty arrays/objects add unnecessary & symbols

[chrisvanpatten]

In PHP, keys with empty arrays or objects are not added to the query string.

For example in PHP:

http_build_query([ 'dog' => 1, 'cat' => [], 'mouse' => new StdClass(), 'rabbit' => 2 ]);
// Returns: "dog=1&rabbit=2"

Interactive PHP test case: https://3v4l.org/l1haG

http-build-query doesn't add these to the query string, which is correct, but does add extraneous & symbols:

hbq( { 'dog': 1, 'cat': [], 'mouse': {}, 'rabbit': 2 } );
// Returns: "dog=1&&&rabbit=2"

Interactive JS test case: https://runkit.com/cvp/5b265e43c28df80012c7edd7

These extra & symbols don't hurt anything, but don't match the PHP implementation.