duckduckgo/zeroclickinfo-goodies — pull request #729 by mwmiller (2014-11-04 22:45:47+00:00)
Title: Calculator: better guard for no-ops.

The old guard was kinda whacky (and wrong) and inverted all the logic.
So we'll dump out early when we recognize that no operations will be
done.

Intended to fix #728.