Make build a bit more friendly, and informative.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/build.js b/lib/build.js
index 90ec1761a..3df93eb81 100644
--- a/lib/build.js
+++ b/lib/build.js
@@ -20,6 +20,7 @@ var npm = require("../npm")
   , lifecycle = require("./utils/lifecycle")
   , readJson = require("./utils/read-json")
   , ini = require("./utils/ini")
+  , sys = require("sys")
 
 module.exports = build
 
@@ -36,15 +37,17 @@ function build (args, cb) {
     })(args.shift())
   }
   var pkg = args[0]
+  if (!pkg) cb()
 
   // if pkg isn't an object, then parse the package.json inside it, and build with that.
   if (typeof pkg === "string") {
+    log(pkg, "build")
     return readAndBuild(pkg, cb)
   }
 
   pkg = pkg && pkg._data || pkg
 
-  if (!pkg) return cb(new Error("Invalid package data"))
+  if (!pkg) return cb(new Error("Invalid package data "+sys.inspect(pkg)))
 
   var ROOT = npm.root
     , npmdir = npm.dir