Template Node sticks with first Template it receives, ignoring subsequent ones

[abender]

What are the steps to reproduce?

Create a Flow with

• One Template Node, that has no default Template but uses msg.template.
• 2 Function Nodes, one will set 'msg.template = "Foo"', the other one 'msg.template = "Bar"'
• Connect the Function Nodes with the Template Nodes Input
• Connect the output of Template Node with a new Debug Node
• Connect a new Inject Node with the input of both Function nodes
• Execute

What happens?

In the Debug Log we can read "Foo", "Foo".

What do you expect to happen?

The Debug Log should read "Foo", "Bar".

Please tell us about your environment:

• Node-RED version: 0.18.4
• node.js version: 9.8.0
• npm version: 5.6.0
• Platform/OS: Ubuntu 16.04 LTS
• Browser: Chrome 65

I think the Error is this line: https://github.com/node-red/node-red/blob/master/nodes/core/core/80-template.js#L91 where a new Template only is used if there is none so far. The node should always use the msg.template if it is present.