`path.remove` sometimes throws

We should probably address this in Babel, but I'm occasionally running into cases of `path.remove()` throwing error about context:

Here's an example from trying to run Nuclide codebase through Babili:

```
➜ Nuclide ./scripts/dev/release_transpile.js
7 workers. 1863 files...
Error transpiling "/Users/kangax/fbsource/fbobjc/Tools/Nuclide/pkg/fb-biggrep-cli/lib/biggrep.js"
/Users/kangax/fbsource/fbobjc/Tools/Nuclide/pkg/nuclide-node-transpiler/lib/NodeTranspiler.js:203
throw err;
^

TypeError: unknown: Property consequent of ConditionalExpression expected node to be of a type ["Expression"] but instead got null
at Object.validate (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-types/lib/definitions/index.js:109:13)
at Object.validate (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-types/lib/index.js:511:9)
at NodePath._replaceWith (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-traverse/lib/path/replacement.js:176:7)
at NodePath._remove (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-traverse/lib/path/removal.js:58:10)
at NodePath.remove (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-traverse/lib/path/removal.js:30:8)
at PluginPass.CallExpression (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-plugin-transform-remove-console/lib/index.js:10:16)
at newFn (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-traverse/lib/visitors.js:276:21)
at NodePath._call (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-traverse/lib/path/context.js:76:18)
at NodePath.call (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-traverse/lib/path/context.js:48:17)
at NodePath.visit (/Users/kangax/fbsource/fbobjc/Tools/Nuclide/node_modules/babel-traverse/lib/path/context.js:105:12)
```

I narrowed it down to a combination of simplify and remove-console plugins, but there might be something else. The source code doesn't have anything unusual; just few expressions with `console.log` and `console.error`.

Temporary solution could be to wrap `path.remove()` in try/catch. Ideal one would be to find out what's causing this and fix it in Babel.