Return an empty array if there is no ignore file

src/IgnoreFile.php

@@ -10,6 +10,10 @@ final class IgnoreFile
 
     public static function parse(): array
     {
+        if (@stat(self::FILENAME) === false) {
+            return [];
+        }
+
         return explode("\n", file_get_contents(self::FILENAME));
     }
 }

tests/Kernel/IgnoreFileTest.php

@@ -18,4 +18,9 @@ class IgnoreFileTest extends KernelTestCase
 
         self::assertSame(['phpstan.neon.dist'], IgnoreFile::parse());
     }
+
+    public function test_it_returns_an_empty_array_of_filenames_if_there_is_no_ignore_file(): void
+    {
+        self::assertSame([], IgnoreFile::parse());
+    }
 }