type fixes

application/Espo/Classes/TemplateHelpers/TableTag.php

@@ -47,9 +47,13 @@ class TableTag implements Helper
             $attributesPart .= " width=\"{$width}\"";
         }
 
+        $function = $data->getFunction();
+
+        $content = $function !== null ? $function() : '';
+
         return Result::createSafeString(
             "<table border=\"{$border}\" cellpadding=\"{$cellpadding}\" {$attributesPart}>" .
-            $data->getFunction()() .
+            $content .
             "</table>"
         );
     }

application/Espo/Classes/TemplateHelpers/TdTag.php

@@ -51,10 +51,12 @@ class TdTag implements Helper
             $attributesPart .= " width=\"{$width}\"";
         }
 
+        $function = $data->getFunction();
+
+        $content = $function !== null ? $function() : '';
+
         return Result::createSafeString(
-            "<td>" .
-            $data->getFunction()() .
-            "</td>"
+            "<td>" . $content . "</td>"
         );
     }
 }

application/Espo/Classes/TemplateHelpers/TrTag.php

@@ -37,10 +37,12 @@ class TrTag implements Helper
 {
     public function render(Data $data): Result
     {
+        $function = $data->getFunction();
+
+        $content = $function !== null ? $function() : '';
+
         return Result::createSafeString(
-            "<tr>" .
-            $data->getFunction()() .
-            "</tr>"
+            "<tr>" . $content . "</tr>"
         );
     }
 }

application/Espo/Core/Htmlizer/Helper/Data.php

@@ -30,6 +30,7 @@
 namespace Espo\Core\Htmlizer\Helper;
 
 use stdClass;
+use Closure;
 
 class Data
 {
@@ -55,12 +56,12 @@ class Data
     private $rootContext;
 
     /**
-     * @var ?callable
+     * @var ?Closure
      */
     private $func = null;
 
     /**
-     * @var ?callable
+     * @var ?Closure
      */
     private $inverseFunc = null;
 
@@ -77,8 +78,8 @@ class Data
         array $context,
         array $rootContext,
         int $blockParams,
-        ?callable $func,
-        ?callable $inverseFunc
+        ?Closure $func,
+        ?Closure $inverseFunc
     ) {
         $this->name = $name;
         $this->argumentList = $argumentList;
@@ -137,12 +138,12 @@ class Data
         return $this->options->$name ?? null;
     }
 
-    public function getFunction(): ?callable
+    public function getFunction(): ?Closure
     {
         return $this->func;
     }
 
-    public function getInverseFunction(): ?callable
+    public function getInverseFunction(): ?Closure
     {
         return $this->inverseFunc;
     }