Not expected parenthesis bug

This simple template:

``` jade
div
  if tabs
    div
  != myvar
```

generates:

``` html
<div><?php if ($tabs) : ?><div></div><?php endif ?>(<?= $myvar ?>)</div>
```

— note the parenthesis around `<?= $myvar ?>`.

Changing it to either

``` jade
div
  if tabs
    div
  div!= myvar
```

or 

``` jade
div
  if tabs
    div
  | 
  != myvar
```

(whitespace goes after |) — removes the parenthesis.
