function onBundle( error, bool ) {
		if ( error ) {
			debug( 'Encountered an error when generating a bundle. Package: %s (%d of %d). Destination: %s. Error: %s', pkg, i+1, total, dpath, error.message );
			return clbk( error );
		}
		if ( bool ) {
			debug( 'Successfully generated a bundle.' );
		} else {
			debug( 'No bundle generated.' );
		}
		done();
	}
Callback invoked upon generating a bundle.

@private
@param {(Error|null)} error - error object
@param {boolean} bool - boolean indicating whether a bundle was created
@returns {void}