finally always returns value

[bloody-ux]

Sval doesn't deal with finally statement correctly, it doesn't check whether there's RETURN value before return, which leads below case failed.

Test case:

const Sval = require('sval')

const interpreter = new Sval({ ecmaVer: 8 })

interpreter.run(`
    function T() {
      try {
        return 7;
      } catch (ex) {
        return 5;
      } finally {
        
      }
    }

    console.log(T());
    exports.end = true;
`)

module.exports = 'End: ' + interpreter.exports.end

Expected result:

7

Actual result:

undefined

Cause: always returns value. needing to check whether there's a RETURN.