Edited Issue: intellisense disappears after closing VS when there is an incomplete statement in editor [1706]

1) create new console project
2) npm install async
3) type code in editor
```
require('async')
async.all
```
4) F12 on 'all', and go to definition. (takes you to right place in async.js)
5) save, close, and reopen project
6) F12 on 'all' - doesn't work... instead pops up this dialog:
```
---------------------------
Node.js Tools for Visual Studio
---------------------------
Cannot go to definition "async.all"
---------------------------
OK
---------------------------
```
And intellisense is completely borked until you delete the .dat file and reload the project.


This issue doesn't seem to occur if the statement is complete