segfault in current master

[deanmao]

FYI, I tried merging the new libsass into our current node-sass repo that uses it. Something added in recently caused it to segfault. When I run it through gdb, it complains on this line:

string path_string(img_path_str);

This line is found in context.cpp on line 63. I haven't had time to investigate it, but it looks like this was new code added in a few hours ago.

[akhleung]

Oops, the API has changed slightly -- the sass_options struct now has a field for the path where image assets are located; this is used by the image-url function to automatically splice together paths to images. I'll add a null check to prevent the segfault in the event that the image_path field isn't set.

[akhleung]

All right, made the fix. Please try the latest master.

[deanmao]

Looks good here.