Pattern matching with an empty hash should result in no match

**Environment Information**
  
Provide at least:
* JRuby version (`jruby -v`): jruby 9.4.3.0 (3.1.4) 2023-06-07 3086960792 OpenJDK 64-Bit Server VM 25.372-b07 on 1.8.0_372-b07 +jit [aarch64-linux]


**Expected Behavior**

```ruby
{a: 0} => {}
#=> {:a=>0}: {:a=>0} is not empty (NoMatchingPatternError)
```

**Actual Behavior**

```ruby
{a: 0} => {}
=> nil
```
