Throws a missleading error a the module fails to load

Currently this module swallows all errors when the trying to load a module.

I suggest adding this to the catch block:

```
if(ex.code !== 'MODULE_NOT_FOUND') {
throw ex;
}
```

This allows the module to still search up the stack, but if it finds a module and has a legitimate error loading the module you can still catch that error.

Inspect the module-loading catch block in the node-parent-require code and trace how it searches parent modules. Preserve the search behavior for missing modules while ensuring legitimate errors from a found module are not swallowed. Verify both cases with the existing project tests, if available.

Written by the indexing model from the issue text.