spm build 出来的都是空的文件

我 spm install arale/validator 下载了验证组件，然后去validator的目录运行 spm build 会生成dist目录，但是里边的文件都是空的。

    Task: "clean:build" (clean) task

       Task: "spm-install" task

    install: arale/widget@1.1.1
      fetch: arale/widget@1.1.1
    extract: ~/.spm/cache/arale/widget/1.1.1/widget-1.1.1.tar.gz
      found: dist in the package
  installed: sea-modules/arale/widget/1.1.1
    depends: arale/base@1.1.1

    install: arale/base@1.1.1
      fetch: arale/base@1.1.1
    extract: ~/.spm/cache/arale/base/1.1.1/base-1.1.1.tar.gz
      found: dist in the package
  installed: sea-modules/arale/base/1.1.1
    depends: arale/class@1.1.0, arale/events@1.1.0

    install: arale/class@1.1.0
      fetch: arale/class@1.1.0
    extract: ~/.spm/cache/arale/class/1.1.0/class-1.1.0.tar.gz
      found: dist in the package
  installed: sea-modules/arale/class/1.1.0

    install: arale/events@1.1.0
      fetch: arale/events@1.1.0
    extract: ~/.spm/cache/arale/events/1.1.0/events-1.1.0.tar.gz
      found: dist in the package
  installed: sea-modules/arale/events/1.1.0

       Task: "transport:src" (transport) task
  transport: 0 files

       Task: "concat:css" (concat) task
   concated: 0 files

       Task: "transport:css" (transport) task
  transport: 0 files

       Task: "concat:js" (concat) task
   concated: 4 files

       Task: "copy:build" (copy) task

       Task: "cssmin:css" (cssmin) task

       Task: "uglify:js" (uglify) task
       file: ".build/dist/core.js" created.
       file: ".build/dist/validator.js" created.

       Task: "clean:dist" (clean) task

       Task: "copy:dist" (copy) task
     copied: 4 files

       Task: "clean:build" (clean) task
   cleaning: .build...

       Task: "spm-newline" task
     create: dist/core-debug.js
     create: dist/core.js
     create: dist/validator-debug.js
     create: dist/validator.js

       Done: without errors.

spmjs / spm2

spm build 出来的都是空的文件 #118