Error with docsify option onlyCover=true #38
Description
Hello,
The problem is that when I set the option "onlyCover" to true then docsify is in an infinite render loop.
In my opinion the plugin tries to set the theme switcher button on the cover but on the HTML page of the cover there is no hook for it. But now your script tries to find the HTML tag and use the property "setAttribute". Here it needs a check for NULL.
A Screenshot from the error
The content from the specified file
window.$docsify.plugins=[].concat((e,t)=>{let o={siteFont:"PT Sans",defaultTheme:"dark",codeFontFamily:"Roboto Mono, Monaco, courier, monospace",bodyFontSize:"17px",dark:{accent:"#42b983",toogleBackground:"#ffffff",background:"#091a28",toogleImage:"url(https://cdn.jsdelivr.net/npm/docsify-darklight-theme@latest/icons/sun.svg)"},light:{accent:"#42b983",toogleBackground:"#091a28",background:"#ffffff",toogleImage:"url(https://cdn.jsdelivr.net/npm/docsify-darklight-theme@latest/icons/moon.svg)"}};if(t.config.hasOwnProperty("darklightTheme")){for(var[r,d]of Object.entries(t.config.darklightTheme))"light"!==r&&"dark"!==r&&"defaultTheme"!==r&&(o[r]=d);for(var[r,d]of Object.entries(o))"light"!==r&&"dark"!==r&&(o[r]=d,document.documentElement.style.setProperty("--"+r,d));if(t.config.darklightTheme.hasOwnProperty("dark"))for(var[r,d]of Object.entries(t.config.darklightTheme.dark))o.dark[r]=d;if(t.config.darklightTheme.hasOwnProperty("light"))for(var[r,d]of Object.entries(t.config.darklightTheme.light))o.light[r]=d}else for(var[r,d]of Object.entries(o))"light"!==r&&"dark"!==r&&(o[r]=d,document.documentElement.style.setProperty("--"+r,d));window.matchMedia("(prefers-color-scheme: dark)").matches?o.defaultTheme="dark":window.matchMedia("(prefers-color-scheme: light)").matches&&(o.defaultTheme="light");var i=e=>{if(document.getElementById("docsify-darklight-theme").setAttribute("data-link-title",e),document.getElementById("docsify-darklight-theme").click(),localStorage.setItem("DARK_LIGHT_THEME",e),o.defaultTheme=e,"light"==e)for(var[t,r]of Object.entries(o.light))document.documentElement.style.setProperty("--"+t,r);else if("dark"==e)for(var[t,r]of Object.entries(o.dark))document.documentElement.style.setProperty("--"+t,r)};e.afterEach((function(e,t){t(e='<div id="docsify-darklight-theme"><p>.</p></div>'+e)})),e.doneEach((function(){let e=localStorage.getItem("DARK_LIGHT_THEME");"light"==e||"dark"==e?(o.defaultTheme=e,i(o.defaultTheme)):i(o.defaultTheme),document.getElementById("docsify-darklight-theme").addEventListener("click",(function(){"light"===o.defaultTheme?i("dark"):i("light")}))}))},window.$docsify.plugins);