Problem: Previously in gh-117 we aimed to solve gh-115, which described a problem where we used `SET DEFAULT` and then `DROP DEFAULT` immediately afterward. The solution was to track whether any defaults are retained, but the `ends_with_default` variable is initialized as `None` rather than `False`. At the end of the function we check whether `ends_with_default is False`, never occurs unless a default is set.
Solution: Assume that there is no default unless proven otherwise, and iniitializie `ends_with_default` to `False` instead of `None`.
Fixes: gh-158
Christian Bundy
David Wobrock