DX: there is no namespace if there is no PHP code (#7953)

src/Tokenizer/Analyzer/NamespacesAnalyzer.php

@@ -64,7 +64,7 @@ final class NamespacesAnalyzer
             $index = $scopeEndIndex;
         }
 
-        if (0 === \count($namespaces)) {
+        if (0 === \count($namespaces) && $tokens->isTokenKindFound(T_OPEN_TAG)) {
             $namespaces[] = new NamespaceAnalysis('', '', 0, 0, 0, \count($tokens) - 1);
         }
 

tests/Tokenizer/Analyzer/NamespacesAnalyzerTest.php

@@ -86,6 +86,12 @@ final class NamespacesAnalyzerTest extends TestCase
                 17
             ),
         ]];
+
+        yield [
+            'there is no namespace if there is no PHP code',
+            [
+            ],
+        ];
     }
 
     /**
@@ -155,19 +161,6 @@ final class NamespacesAnalyzerTest extends TestCase
                 17
             ),
         ];
-
-        yield [
-            ' ',
-            0,
-            new NamespaceAnalysis(
-                '',
-                '',
-                0,
-                0,
-                0,
-                0
-            ),
-        ];
     }
 
     public function testInvalidIndex(): void