ResourceScriptEvaluator NullPointerException

### Affected version

HEAD

### Bug description

Problem here:

```
protected Object eval(ScriptEngine engine, ScriptContext context) throws ScriptException {

try (InputStream is = this.getClass().getClassLoader().getResourceAsStream(resourceName);
Reader reader = new InputStreamReader(is)) {
return engine.eval(reader, context);
} catch (IOException ex) {
throw new UncheckedIOException(resourceName + " caused:", ex);
}
}
```

probably catch the NullPointerException and convert it to a ScriptException, or maybe do that in the calling method

Start at ResourceScriptEvaluator.eval, specifically the resource stream and reader setup shown in the issue. Reproduce the missing-resource case and determine how it should be reported; done means it produces a ScriptException instead of a NullPointerException.

Written by the indexing model from the issue text.