Renderer: Log critical instead of error if no matching file renderer configured

src/Renderer/Renderer.php

@@ -29,7 +29,7 @@ class Renderer
         }
 
         if ($this->logger) {
-            $this->logger->error('Unable to find a renderer for template file "{file}"', ['file' => $template]);
+            $this->logger->critical('Unable to find a renderer for template file "{file}"', ['file' => $template]);
         }
 
         return '';

tests/Unit/Renderer/RendererTest.php

@@ -56,7 +56,7 @@ class RendererTest extends TestCase
         $loggerMock = $this->getMockForAbstractClass(LoggerInterface::class);
         $loggerMock
             ->expects($this->once())
-            ->method('error');
+            ->method('critical');
 
         $renderer->setLogger($loggerMock);