Mojo: Mojom: Fix no-namespace handling for C++ generator.

mojo/public/tools/bindings/generators/mojom_cpp_generator.py

 # Copyright 2013 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.
 
 """Generates C++ source files from a mojom.Module."""
 
 from generate import mojom
 from generate import mojom_pack
 from generate import mojom_generator
 
@@ skipping 14 matching lines @@
   mojom.DPPIPE:       "mojo::DataPipeProducerHandle",
   mojom.MSGPIPE:      "mojo::MessagePipeHandle",
   mojom.SHAREDBUFFER: "mojo::SharedBufferHandle",
   mojom.INT64:        "int64_t",
   mojom.UINT64:       "uint64_t",
   mojom.DOUBLE:       "double",
 }
 
 
 def NamespaceToArray(namespace):
-  return namespace.split('.')
+  return namespace.split('.') if namespace else []
 
 def GetNameForKind(kind, internal = False):
   parts = []
   if kind.imported_from:
     parts.extend(NamespaceToArray(kind.imported_from["namespace"]))
     if internal:
       parts.append("internal")
   if kind.parent_kind:
     parts.append(kind.parent_kind.name)
   parts.append(kind.name)
@@ skipping 168 matching lines @@
 
   @UseJinja("cpp_templates/module.cc.tmpl", filters=cpp_filters)
   def GenerateModuleSource(self):
     return self.GetJinjaExports()
 
   def GenerateFiles(self):
     self.Write(self.GenerateModuleHeader(), "%s.h" % self.module.name)
     self.Write(self.GenerateModuleInternalHeader(),
         "%s-internal.h" % self.module.name)
     self.Write(self.GenerateModuleSource(), "%s.cc" % self.module.name)