Fix usage of allowEmpty when also using include / exclude

[chriskrycho]

Note that this implementation is a bit of a mess at this point. I'm happy to try to do some follow-on refactoring, but this solves the actual bug noted in #105 and identified while trying to fix adopted-ember-addons/ember-cli-sass#204.

Fixes #105.

[rwjblue]

We need a test like

broccoli-funnel/tests/index.js

Lines 471 to 494 in bfea8d4

	it('does not error with input node at a missing nested source', function() {
	let inputPath = `${FIXTURE_INPUT}/dir1`;
	let node = new Funnel(inputPath, {
	srcDir: 'subdir3',
	allowEmpty: true,
	});
	let expected = [];
	builder = new broccoli.Builder(node);
	return builder.build()
	.then(results => {
	let outputPath = results.directory;
	expect(walkSync(outputPath)).to.eql(expected);
	})
	.then(() => builder.build())
	.then(results => {
	let outputPath = results.directory;
	expect(walkSync(outputPath)).to.eql(expected);
	});
	});
	});

(when allowEmpty is true, and input path doesn't exist). That test will likely answer your question RE: what to do in the fallback else case.

[rwjblue]

Sorry for the run around, could you also create a test like:

    it('creates nested output path when input node at a missing nested source', function() {
      let inputPath = `${FIXTURE_INPUT}/dir1`;
      let node = new Funnel(inputPath, {
        include: ['*'],
        srcDir: 'subdir3',
        destDir: 'some-place',
        allowEmpty: true,
      });

       let expected = ['some-place/'];

       builder = new broccoli.Builder(node);
      return builder.build()
        .then(results => {
          let outputPath = results.directory;

           expect(walkSync(outputPath)).to.eql(expected);
        })
        .then(() => builder.build())
        .then(results => {
          let outputPath = results.directory;

          expect(walkSync(outputPath)).to.eql(expected);

          return builder.build();
        })
        .then(results => {
          let outputPath = results.directory;

          expect(walkSync(outputPath)).to.eql(expected);
        });
    });

[chriskrycho]

Added that test also, @rwjblue.

[chriskrycho]

Ping @rwjblue – AppVeyor failure is unrelated.

[rwjblue]

Released in v2.0.2.