[PATCH] sprinters: bugfix when NULL passed for a string.

[David Bremner]

Mark Walters <markwalters1009 at gmail.com> writes:

> The string function in a sprinter may be called with a NULL string
> pointer (eg if a header is absent). This causes a segfault. We fix
> this by checking for a null pointer in the string functions 

pushed, 

d