Merge pull request #430 from deckgo/fix-highlight

fix(#423): not displayed place holder

Author: peterpeterparker

webcomponents/highlight-code/src/components/highlight-code/deckdeckgo-highlight-code.tsx

@@ -181,6 +181,11 @@ export class DeckdeckgoHighlightCode {
     return new Promise<void>(async (resolve, reject) => {
       const container: HTMLElement = this.el.shadowRoot.querySelector('div.deckgo-highlight-code-container');
 
+      if (!code || code === undefined || code === '') {
+        resolve();
+        return;
+      }
+
       if (container) {
         try {
           // clear the container first

webcomponents/highlight-code/src/index.html

@@ -131,7 +131,7 @@ <h1>Without line numbers</h1>
 </deckgo-highlight-code>
 
 <h1>Issue #423</h1>
-<deckgo-highlight-code language="java" highlight-lines="6,7">
+<deckgo-highlight-code language="java" highlight-lines="6,7 13,14">
   <code slot="code"># main.tf
 
     resource "aws_lambda_function" "api" {