imbo/imbo — pull request #237 by christeredvartsen (2013-12-26 10:02:54+00:00)
Title: An invalid transformation parameter can generates a PHP Warning

When the `t` query parameter is not used as an array, or if any of its elements are not strings, Imbo generates PHP Warnings. Imbo should instead respond with `HTTP 400`.

Both these examples will generate errors:

t[][]=desaturate
t=desaturate