[Console] Do no preprend empty line if the buffer is empty

Author: lyrixx

Style/SymfonyStyle.php

@@ -375,7 +375,7 @@ private function autoPrependText(): void
     {
         $fetched = $this->bufferedOutput->fetch();
         // Prepend new line if last char isn't EOL:
-        if (!str_ends_with($fetched, "\n")) {
+        if ($fetched && !str_ends_with($fetched, "\n")) {
             $this->newLine();
         }
     }

Tests/Fixtures/Style/SymfonyStyle/command/command_23.php

@@ -0,0 +1,11 @@
+<?php
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+// ensure that nested tags have no effect on the color of the '//' prefix
+return function (InputInterface $input, OutputInterface $output) {
+    $output = new SymfonyStyle($input, $output);
+    $output->text('Hello');
+};

Tests/Fixtures/Style/SymfonyStyle/output/output_23.txt

@@ -0,0 +1 @@
+ Hello

Tests/Fixtures/Style/SymfonyStyle/output/output_6.txt

@@ -1,4 +1,3 @@
-
  * Lorem ipsum dolor sit amet
  * consectetur adipiscing elit