prevent ph8 warnings, fixes #12

lib/ExcalidrawBlock.php

@@ -91,14 +91,15 @@ class ExcalidrawBlock extends BlockType
     public function getFiles(): array
     {
         $payload = $this->getPayload();
-        if (!$payload['file_id'] && !$payload['folder_id']) {
+        if (empty($payload['file_id']) && empty($payload['folder_id'])) {
             return [];
         }
 
-        if ($payload['file_id']) {
+        if (!empty($payload['file_id'])) {
             $files = [];
 
-            if ($fileRef = \FileRef::find($payload['file_id'])) {
+            $fileRef = \FileRef::find($payload['file_id']);
+            if ($fileRef) {
                 $files[] = $fileRef;
             }
 

views/excalidraw/excalidraw_app.php

@@ -22,7 +22,7 @@
 <? endif ?>
 
 <div class="excalidraw-content">
-    <? if ($content_bar_text) : ?>
+    <? if (!empty($content_bar_text)) : ?>
         <?= ContentBar::get()
             ->setTOC(new TOCItem($content_bar_text))
             ->setIcon(Icon::create('content'));