18 - output failure if first item in iterable is empty string

[mmulich]

Have the application return an iterable where the first item is an empty
string. wsgi_intercept will fail to process the remaining items in the
iterable.  The solution is to dedent by 1 level the following lines in the
"makefile function", so that the loop runs regardless of whether the first
element was an emptyt string: 

```
while 1:
    data = self.result.next()
    self.output.write(data)
```

Original link: http://code.google.com/p/wsgi-intercept/issues/detail?id=18