Fix nodists#181: Don't set any version without checking if its valid

cli.js

@@ -356,23 +356,26 @@ else if (command.match(/^local$/i) && argv[1]) {
 // GLOBAL globally use the specified node version
 else if (command.match(/^global$/i) && argv[1] || argv[0] && !argv[1]) {
   spec = argv[1] || argv[0];
-  n.setGlobal(spec, function(err) {
-    if(err) abort(err.message+'. Sorry.');
-    console.log(spec);
-    n.resolveVersionLocally(spec, function(er, found) {
-      if(found) {
-        exit();
-      }
-      n.resolveVersion(spec, function(er, version) {
-        console.log("Installing "+version)
-        n.install(version, function(er) {
-          if(er) return abort(er.message+'. Sorry.')
+  console.log(spec);
+  n.resolveVersionLocally(spec, function(er, found) {
+    if(found) {
+      return n.setGlobal(spec, function(err) {
+	if(err) abort(err.message+'. Sorry.')
+        exit(0, 'Default global pacakge update dsuccessful.')
+      })
+    }
+    n.resolveVersion(spec, function(er, version) {
+      if(er) return abort(er.message+'. Sorry.')
+      console.log("Installing "+version)
+      n.install(version, function(er) {
+        if(er) return abort(er.message+'. Sorry.')
+        n.setGlobal(spec, function(err) {
+	  if(err) abort(err.message+'. Sorry.')
           exit(0, 'Installation successful.')
         })
       })
     })
-
-  });
+  })
 }
 // HELP display help for unknown cli parameters
 else {