Debugger entered--Lisp error: (wrong-type-argument listp t)
After the theme got updated to MELPA version 20200908.1939 today, I get the following error on emacs startup.
```
Debugger entered--Lisp error: (wrong-type-argument listp t)
assoc(3 t)
modus-vivendi-theme-heading-p(3)
modus-vivendi-theme-heading(3 "#c6eaff" "#29aeff" "#0f0e39" "#3c3c3c")
byte-code("\306\307\310\311#\312\313\314\315\316\317\320\321\322\323\324\325\326\327\330\331\332\333\334\335\336\337\340\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357\360\361\362\363\364\365\366..." [modus-vivendi-theme-slanted-constructs modus-vivendi-theme-variable-pitch-headings emacs-major-version modus-vivendi-theme-intense-hl-line modus-vivendi-theme-scale-4 modus-vivendi-theme-scale-3 function-put modus-vivendi-theme-with-color-variables lisp-indent-function 0 ((class color) (min-colors 89)) "#000000" "#ffffff" "#181a20" "#a8a8a8" "#110b11" "#e0e6f0" "#2f2f2f" "#f5f5f5" "#202020" "#bebebe" "#203448" "#c6eaff" "#00322e" "#bfebe0" "#382f27" "#f8dec0" "#392a48" "#fbd6f4" "#ff8059" "#44bc44" "#eecc00" "#29aeff" "#feacd0" "#00d3d0" "#f4923b" "#80d200" "#cfdf30" "#72a4ff" "#f78fe7" "#4ae8fc" "#ff9977" "#00cd68" "#f0ce43" "#00bdfa" "#b6a0ff" "#6ae4b9" "#ffa0a0" "#88cf88" "#d2b580" ...] 2514)
require(modus-vivendi-theme nil t)
(not (require 'modus-vivendi-theme nil t))
(if (not (require 'modus-vivendi-theme nil t)) (display-warning 'use-package (format "Cannot load %s" 'modus-vivendi-theme) :error))
(progn (condition-case err (progn (setq modus-vivendi-theme-fringes 'subtle) (setq modus-vivendi-theme-prompts 'subtle) (setq modus-vivendi-theme-rainbow-headings t) (setq modus-vivendi-theme-scale-headings t) (setq modus-vivendi-theme-section-headings t) (setq modus-vivendi-theme-variable-pitch-headings t)) ((debug error) (funcall use-package--warning1 :init err))) (if (not (require 'modus-vivendi-theme nil t)) (display-warning 'use-package (format "Cannot load %s" 'modus-vivendi-theme) :error)))
(condition-case err (progn (condition-case err (progn (setq modus-vivendi-theme-fringes 'subtle) (setq modus-vivendi-theme-prompts 'subtle) (setq modus-vivendi-theme-rainbow-headings t) (setq modus-vivendi-theme-scale-headings t) (setq modus-vivendi-theme-section-headings t) (setq modus-vivendi-theme-variable-pitch-headings t)) ((debug error) (funcall use-package--warning1 :init err))) (if (not (require 'modus-vivendi-theme nil t)) (display-warning 'use-package (format "Cannot load %s" 'modus-vivendi-theme) :error))) ((debug error) (funcall use-package--warning1 :catch err)))
eval-buffer(#<buffer *load*> nil "/home/hta/.emacs" nil t) ; Reading at buffer position 3341
load-with-code-conversion("/home/hta/.emacs" "/home/hta/.emacs" t t)
load("~/.emacs" noerror nomessage)
startup--load-user-init-file(#f(compiled-function () #<bytecode 0x34c36773a626203>) #f(compiled-function () #<bytecode 0x81a386fa1b191d3>) t)
command-line()
normal-top-level()
```
My theme config is this:
```
(use-package modus-vivendi-theme
:ensure t
:init
(setq modus-vivendi-theme-fringes 'subtle)
(setq modus-vivendi-theme-prompts 'subtle)
(setq modus-vivendi-theme-rainbow-headings t)
(setq modus-vivendi-theme-scale-headings t)
(setq modus-vivendi-theme-section-headings t)
(setq modus-vivendi-theme-variable-pitch-headings t))
(load-theme 'modus-vivendi)
```
I'm using the current Emacs git master branch, thought this shouldn't matter.
issue
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