Update description label value

[dkhamsing]

Not 100% sure this is what was intended, but it fixes the crash

Here's the gist model

    createdAt = "2015-03-23 15:44:43 +0000";
    descriptionText = "";
    files =     (
    );
    gistID = 969;
    htmlURL = nil;
    jsonURL = "https://api.github.com/gists/969f2df7166ec8f11969";
    public = 1;
    updatedAt = nil;
    user = nil;

Close #21

[dkhamsing]

Uh this was also in #18