fix: nil description in mcp cause completion to fail

[sdoyle88]

Overview

First, thank you for a great project! I have been playing around with ECA, and it's a great package. However, with Corfu enabled, autocompletions did not work with the / command if I had an MCP configuration with a nil description.

For example, with the flux-mcp server

eca-chat--completion-prompts-annotate(#("flux-operator-mcp:debug_flux_helmrelease" 0 40 
(eca-chat-completion-item (:name "flux-operator-mcp:debug_flux_helmrelease" :description nil :arguments 
[(:name "name" :description "The name of the Flux resource." :required t)
 (:name "namespace" :description "The namespace of the Flux resource." :required t) 
(:name "cluster" :description "The context name of the cluster, defaults to current." :required nil)] :type "mcpPrompt"))))

Note that the description is nil, and this causes a corfu error. With the update of the eca-chat--completion-prompts-annotate function, this allows for us to check if this is nil and if it is handle it gracefully. Happy if you want to adjust this in any way, just a simple fix I found for a small bug

.

[ericdallo]

Thank you!
And yes, that makes sense, thanks again!