UI for compile issues that don't have a line number

If a compile error is missing a location you can't see it.

### Expected behavior

Perhaps hovering over compile error should show the message in all cases

### Actual behavior

Can't see it

### Steps to reproduce the behavior

```
LET EventData := input();
LET SqrlClock := TweetDate;
LET TweetDate := SqrlClock;
```

Circular feature definitions don't have locations it seems.