Transform error should not kill build

[mattdesl]

Getting this when using an invalid filename to sheetify function:

assert.js:89
  throw new assert.AssertionError({
  ^
AssertionError: filename must be a string
    at parseCss (/projects/mattdesl.github.com/node_modules/sheetify/index.js:31:10)
    at sheetify (/projects/mattdesl.github.com/node_modules/sheetify/index.js:23:17)
    at nr (/projects/mattdesl.github.com/node_modules/browserify/node_modules/module-deps/index.js:297:23)
    at /projects/mattdesl.github.com/node_modules/browserify/node_modules/resolve/lib/async.js:44:21
    at ondir (/projects/mattdesl.github.com/node_modules/browserify/node_modules/resolve/lib/async.js:187:31)
    at onex (/projects/mattdesl.github.com/node_modules/browserify/node_modules/resolve/lib/async.js:93:22)
    at /projects/mattdesl.github.com/node_modules/browserify/node_modules/resolve/lib/async.js:24:18
    at FSReqWrap.oncomplete (fs.js:82:15)

And it kills budo and other tools. Instead, might be better for the transform to emit an error event so budo and similar tools can catch it and display this error in the browser.

[mattdesl]

Hmm, I think maybe this issue is a bit different. I get the error even when my path is correct

[mattdesl]

D'oh! I'm a tool. I was using -t sheetify instead of -t sheetify/transform

[mattdesl]

I've noticed some other errors like #49 are killing the build, so I will re-open this issue since it's mostly about not killing the build on errors. 😄

[yoshuawuyts]

Ah yes, you're fully right I'll make sure #49 emits an error (let's see if it can be tested properly ^^) Thanks for raising!

[yoshuawuyts]

Cool, so I've created patch for this that should at least catch this particular error - I feel some refactoring might be in place to make this more solid. I'll upload it once I get home because I'm silly and don't have a VPN that can circumvent cafe firewall 😕 haha

[yoshuawuyts]

Should be resolved in #52 (mostly, I hope we're not accidentally throwing for more runtime errors - hah) Thanks!