distill-pattern-data errors out

Description of the problem

it seems like distill-pattern-data needs more guardrails to gracefully degrade

Steps to reproduce it

use policies list template for another list page...

1. put stuff in place

   mkdir layouts/month
   cp themes/wplshortcodes/layouts/policies/list.html layouts/month/list.html

2. run hugo

   _local/bin/wpl-serve-hugo _local/kieraLocal 

3. observe chaos ensue

   Error: error building site: 
   render: failed to render pages: 
     render of "taxonomy" failed: 
     execute of template failed: 
       template: month/list.html:58:33: 
         executing "main" at <partial "util/distill-pattern-data.html" (dict "context" ($listItch.Get "page") "scope" $patternDataDict)>: 
         error calling partial: 
           "themes/wplshortcodes/layouts/partials/util/distill-pattern-data.html:201:20": 
           execute of template failed: 
           template: partials/util/distill-pattern-data.html:201:20: 
             executing "partials/util/distill-pattern-data.html" at <len $typeStyleColorMap>: 
               error calling len: 
                 len of type bool

Expected behavior

I'd expect warning lights and klaxons when data isn't available, or properly structured.

Behavior detected

• 🤠🐴🎸🎤🎶🔊💩 Country music starts playing from every speaker in the house...

• 🤨🤔⁉️🗯️🧌 People start thinking the orange goblin makes sense.

Utter Chaos.

Screenshots

If relevant, copy and paste screenshots or photos of the problem here.