impl/memory: Disallow empty namespace.

impl/prod/context.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package prod
 
 import (
         "fmt"
         "net/http"
         "net/http/cookiejar"
@@ skipping 39 matching lines @@
         return aeCtx
 }
 
 // AEContextNoTxn retrieves the raw "google.golang.org/appengine" compatible
 // Context that's not part of a transaction.
 func AEContextNoTxn(c context.Context) context.Context {
         aeCtx, _ := c.Value(prodContextNoTxnKey).(context.Context)
         if aeCtx == nil {
                 return nil
         }
-        aeCtx, err := appengine.Namespace(aeCtx, info.Get(c).GetNamespace())
-        if err != nil {
-                panic(err)
+
+        if ns, has := info.Get(c).GetNamespace(); has {
+                var err error
+                aeCtx, err = appengine.Namespace(aeCtx, ns)
+                if err != nil {
+                        panic(err)
+                }
         }
         if deadline, ok := c.Deadline(); ok {
                 aeCtx, _ = context.WithDeadline(aeCtx, deadline)
         }
         return aeCtx
 }
 
 func setupAECtx(c, aeCtx context.Context) context.Context {
         c = context.WithValue(c, prodContextKey, aeCtx)
         c = context.WithValue(c, prodContextNoTxnKey, aeCtx)
@@ skipping 81 matching lines @@
                 }
         }
 
         aeCtx, err := remote_api.NewRemoteContext(host, client)
         if err != nil {
                 return
         }
         *inOutCtx = setupAECtx(*inOutCtx, aeCtx)
         return nil
 }