ImportHandler: Use truthiness to signal conversion handled

doc/api/hooks_server-side.md

@@ -812,8 +812,8 @@ exports.exportEtherpadAdditionalContent = () => ['comments'];
 Called from: `src/node/handler/ImportHandler.js`
 
 Called when a user submits a document for import, before the document is
-converted to HTML. The hook function should return `undefined` (or an empty
-list) if it did NOT convert convert the document to HTML.
+converted to HTML. The hook function should return a truthy value if the hook
+function elected to convert the document to HTML.
 
 Context properties:
 

src/node/handler/ImportHandler.js

@@ -142,11 +142,8 @@ const doImport = async (req, res, padId) => {
   }
 
   const destFile = path.join(tmpDirectory, `etherpad_import_${randNum}.${exportExtension}`);
-
-  // Logic for allowing external Import Plugins
-  const result = await hooks.aCallAll('import', {srcFile, destFile, fileEnding});
-  const importHandledByPlugin = (result.length > 0); // This feels hacky and wrong..
-
+  const importHandledByPlugin =
+      (await hooks.aCallAll('import', {srcFile, destFile, fileEnding})).some((x) => x);
   const fileIsEtherpad = (fileEnding === '.etherpad');
   const fileIsHTML = (fileEnding === '.html' || fileEnding === '.htm');
   const fileIsTXT = (fileEnding === '.txt');