Prevent failing addNamespace method

src/Domain/Analyser.php

@@ -10,11 +10,11 @@
 /**
  * Code originally taken from {SebastianBergmann\PHPLOC\Analyser}.
  *
- * @method string    getNamespaceName(array $tokens, int $i)
- * @method bool      isClassDeclaration(array $tokens, int $i)
- * @method int|bool  getPreviousNonWhitespaceTokenPos(array $tokens, $start)
- * @method int|bool  getNextNonWhitespaceTokenPos(array $tokens, $start)
- * @method string    getClassName(string $namespace, array $tokens, int $i)
+ * @method string|false getNamespaceName(array $tokens, int $i)
+ * @method bool         isClassDeclaration(array $tokens, int $i)
+ * @method int|bool     getPreviousNonWhitespaceTokenPos(array $tokens, $start)
+ * @method int|bool     getNextNonWhitespaceTokenPos(array $tokens, $start)
+ * @method string       getClassName(string $namespace, array $tokens, int $i)
  *
  * @internal
  */
@@ -163,7 +163,10 @@ private function analyseFile(Collector $collector, string $filename): void
             switch ($token) {
                 case \T_NAMESPACE:
                     $namespace = $this->getNamespaceName($tokens, $i);
-                    $collector->addNamespace($namespace);
+
+                    if ($namespace !== false) {
+                        $collector->addNamespace($namespace);
+                    }
 
                     break;
 

tests/Domain/Insights/EmptyNamespaceTest.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Domain\Insights;
+
+use NunoMaduro\PhpInsights\Domain\Analyser;
+use Tests\TestCase;
+
+final class EmptyNamespaceTest extends TestCase
+{
+    public function testNotFailingOnAnalyzingEmptyNamespaceFile(): void
+    {
+        $files = [
+            __DIR__ . '/Fixtures/EmptyNamespaceFile.php',
+        ];
+
+        $analyzer  = new Analyser();
+        $collector = $analyzer->analyse(__DIR__ . '/Fixtures/', $files);
+
+        self::assertNotEmpty($collector);
+    }
+}

tests/Domain/Insights/Fixtures/EmptyNamespaceFile.php

@@ -0,0 +1,4 @@
+<?php
+
+namespace {
+}