Fix array to boolean conversion

inc/StyleUtils.php

@@ -57,7 +57,7 @@ class StyleUtils
      */
     protected function mergeStyleInis() {
         static $combined = [];
-        if (!$combined || $this->reinit) {
+        if (empty($combined) || $this->reinit) {
             global $conf;
             global $config_cascade;
             $stylesheets = array(); // mode, file => base

lib/tpl/index.php

@@ -49,7 +49,7 @@ require_once(DOKU_INC.'lib/exe/css.php');
 $styleUtils = new \dokuwiki\StyleUtils($conf['template']);
 $ini = $styleUtils->cssStyleini();
 
-if ($ini) {
+if (!empty($ini)) {
     echo '<table>';
     echo "<caption>".hsc($conf['template'])."'s style.ini</caption>";
     foreach($ini['replacements'] as $key => $val){