Optional tabs (#812)

* chore(deps-dev): bump puppeteer from 13.7.0 to 14.3.0

Bumps [puppeteer](https://github.com/puppeteer/puppeteer) from 13.7.0 to 14.3.0.
- [Release notes](https://github.com/puppeteer/puppeteer/releases)
- [Changelog](https://github.com/puppeteer/puppeteer/blob/main/CHANGELOG.md)
- [Commits](puppeteer/puppeteer@v13.7.0...v14.3.0)

---
updated-dependencies:
- dependency-name: puppeteer
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* All tabs are now optional

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

editor/js/editor.js

@@ -30,16 +30,19 @@
    * }
    */
   function getOutput() {
-    var editorContents = {
-      htmlContent: tabby.editors.html.editor.getValue(),
-      cssContent: tabby.editors.css.editor.getValue(),
-    };
-
-    // not all editor instances have a JS panel
-    if (tabby.editors.js.editor) {
-      editorContents.jsContent = tabby.editors.js.editor.getValue();
-    }
+    var editorContents = {};
+
+    setContent("htmlContent", "html");
+    setContent("cssContent", "css");
+    setContent("jsContent", "js");
 
+    function setContent(propertyName, editorName) {
+      if (tabby.editors[editorName].editor) {
+        editorContents[propertyName] = tabby.editors[editorName].editor.getValue();
+      } else {
+        editorContents[propertyName] = "";
+      }
+    }
     return editorContents;
   }