Options not adding correctly

[donncha]

Options don't appear to be added correctly, at least for the last few days. It's possibly due to the new caching.

I investigated and in wp-includes/functions.php the get_settings() function returns a value that isn't "=== false" when an option does not exist. add_option uses this function to check if an option exists and therefore thinks the option's already there when it isn't.
The attached patch uses get_row() instead of get_var() to query the options table, thus handling the event where option_value == 0.

[ryan]

(In [3023]) Options fixes from donncha. fixes #1859