return false if it's not saved

When we used your class, we could not detect whether the saving succeeded or not, because the saving function itself is wrapped in a condition
```
        if($this->checkLastVersion('vxResource', $version, $this->debug)) {
            return $version->save();
        }
```
This particular method should return false at the end, to mark that there is no ```newResourceVersion``` is made because no condition is met