fix(npm-info): registry unexpectedly returned no json formatted error

This only affected publishing of yet unreleased packages.

lib/npm-info.js

@@ -6,20 +6,21 @@ var efh = require('./error').efh
 
 module.exports = function (pkgName, cb) {
   request(process.env.npm_config_registry + pkgName, efh(cb)(function (response, body) {
-    var pkg = JSON.parse(body)
-
-    if (pkg.error && response.statusCode !== 404) return cb(pkg.error)
-
     var res = {
-      version: '',
-      gitHead: '',
-      pkg: pkg
+      version: null,
+      gitHead: null,
+      pkg: null
     }
 
-    if (response.statusCode === 404) return cb(null, res)
+    if (response.statusCode === 404 || !body) return cb(null, res)
+
+    var pkg = JSON.parse(body)
+
+    if (pkg.error && response.statusCode !== 404) return cb(pkg.error)
 
     res.version = pkg['dist-tags'].latest
     res.gitHead = pkg.versions[res.version].gitHead
+    res.pkg = pkg
 
     cb(null, res)
   }))