failed to activate ide-python package

error:
`call.getFileName is not a function`

**OS:** arch linux

**Version:** latest, just got the issue when updating

Stack trace:
```
TypeError: call.getFileName is not a function
at getErrMessage (assert.js:278:25)
at innerOk (assert.js:372:17)
at ok (assert.js:392:3)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-commons-ui/Dropdown.js:45:21)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-commons-ui/Dropdown.js:305:3)
at Module._compile (/usr/lib/atom/src/native-compile-cache.js:120:30)
at Object.value [as .js] (/usr/lib/atom/src/compile-cache.js:252:23)
at Module.load (internal/modules/cjs/loader.js:992:32)
at Module._load (internal/modules/cjs/loader.js:885:14)
at Function.f._load (electron/js2c/asar_bundle.js:5:12633)
at Module.require (internal/modules/cjs/loader.js:1032:19)
at require (/usr/lib/atom/src/native-compile-cache.js:67:27)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-debugger-common/AutoGenLaunchAttachUiComponent.js:16:17)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-debugger-common/AutoGenLaunchAttachUiComponent.js:519:3)
at Module._compile (/usr/lib/atom/src/native-compile-cache.js:120:30)
at Object.value [as .js] (/usr/lib/atom/src/compile-cache.js:252:23)
at Module.load (internal/modules/cjs/loader.js:992:32)
at Module._load (internal/modules/cjs/loader.js:885:14)TypeError: call.getFileName is not a function
at getErrMessage (assert.js:278:25)
at innerOk (assert.js:372:17)
at ok (assert.js:392:3)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-commons-ui/Dropdown.js:45:21)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-commons-ui/Dropdown.js:305:3)
at Module._compile (/usr/lib/atom/src/native-compile-cache.js:120:30)
at Object.value [as .js] (/usr/lib/atom/src/compile-cache.js:252:23)
at Module.load (internal/modules/cjs/loader.js:992:32)
at Module._load (internal/modules/cjs/loader.js:885:14)
at Function.f._load (electron/js2c/asar_bundle.js:5:12633)
at Module.require (internal/modules/cjs/loader.js:1032:19)
at require (/usr/lib/atom/src/native-compile-cache.js:67:27)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-debugger-common/AutoGenLaunchAttachUiComponent.js:16:17)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-debugger-common/AutoGenLaunchAttachUiComponent.js:519:3)
at Module._compile (/usr/lib/atom/src/native-compile-cache.js:120:30)
at Object.value [as .js] (/usr/lib/atom/src/compile-cache.js:252:23)
at Module.load (internal/modules/cjs/loader.js:992:32)
at Module._load (internal/modules/cjs/loader.js:885:14)
at Function.f._load (electron/js2c/asar_bundle.js:5:12633)
at Module.require (internal/modules/cjs/loader.js:1032:19)
at require (/usr/lib/atom/src/native-compile-cache.js:67:27)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-debugger-common/AutoGenLaunchAttachProvider.js:14:62)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-debugger-common/AutoGenLaunchAttachProvider.js:109:3)
at Module._compile (/usr/lib/atom/src/native-compile-cache.js:120:30)
at Object.value [as .js] (/usr/lib/atom/src/compile-cache.js:252:23)
at Module.load (internal/modules/cjs/loader.js:992:32)
at Module._load (internal/modules/cjs/loader.js:885:14)
at Function.f._load (electron/js2c/asar_bundle.js:5:12633)
at Module.require (internal/modules/cjs/loader.js:1032:19)
at require (/usr/lib/atom/src/native-compile-cache.js:67:27)
at Function.f._load (electron/js2c/asar_bundle.js:5:12633)
at Module.require (internal/modules/cjs/loader.js:1032:19)
at require (/usr/lib/atom/src/native-compile-cache.js:67:27)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-debugger-common/AutoGenLaunchAttachProvider.js:14:62)
at Object. (/home/computer/.atom/packages/ide-python/node_modules/@atom-ide-community/nuclide-debugger-common/AutoGenLaunchAttachProvider.js:109:3)
at Module._compile (/usr/lib/atom/src/native-compile-cache.js:120:30)
at Object.value [as .js] (/usr/lib/atom/src/compile-cache.js:252:23)
at Module.load (internal/modules/cjs/loader.js:992:32)
at Module._load (internal/modules/cjs/loader.js:885:14)
at Function.f._load (electron/js2c/asar_bundle.js:5:12633)
at Module.require (internal/modules/cjs/loader.js:1032:19)
at require (/usr/lib/atom/src/native-compile-cache.js:67:27)
```

**Solutions tried:** reinstalling the package

I've also re-produced this exact same issue on another linux machine.

node_modules/@atom-ide-community/nuclide-commons-ui/Dropdown.js の45行目と305行目付近から始め、スタックトレースに示されている AutoGenLaunchAttachUiComponent.js と AutoGenLaunchAttachProvider.js からの imports を追跡します。更新後の Arch Linux でアクティベーションを再現し、getFileName エラーなしで ide-python がアクティベートされることを確認します。

索引モデルが issue の本文から書いたものです。