dirty chai silently breaking should.exist()

[angusbayley]

Hey there. I'm seeing dirty-chai silently breaking chai's should.exist() pattern, allowing non undefined and null types to pass without raising. This isn't mentioned in the readme.

Example (in node REPL):

> const chai = require('chai');
> const dirtyChai = require('dirty-chai');
> const should = chai.should();

> should.exist(null)
{ AssertionError: expected null to exist[...] }

> chai.use(dirtyChai);
> should.exist(null)
undefined

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