CppEditor: Do not crash on anonymous classes

While performing generate getters and setters we crashed
when using members of anonymous classes.

Change-Id: I27dc8da950345aa4e26ddb1da3914edcffad5af3
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppquickfix_test.cpp

@@ -3273,6 +3273,58 @@ void QuickfixTest::testGenerateGetterSetterOnlySetter()
     QuickFixOperationTest(testDocuments, &factory, ProjectExplorer::HeaderPaths(), 0);
 }
 
+void QuickfixTest::testGenerateGetterSetterAnonymousClass()
+{
+    QList<TestDocumentPtr> testDocuments;
+    QByteArray original;
+    QByteArray expected;
+    QuickFixSettings s;
+    s->setterInCppFileFrom = 1;
+    s->setterParameterNameTemplate = "value";
+
+    // Header File
+    original = R"(
+    class {
+        int @m_foo;
+    } bar;
+)";
+    expected = R"(
+    class {
+        int m_foo;
+
+    public:
+        int foo() const
+        {
+            return m_foo;
+        }
+        void setFoo(int value)
+        {
+            if (m_foo == value)
+                return;
+            m_foo = value;
+            emit fooChanged();
+        }
+        void resetFoo()
+        {
+            setFoo({}); // TODO: Adapt to use your actual default defaultValue
+        }
+
+    signals:
+        void fooChanged();
+
+    private:
+        Q_PROPERTY(int foo READ foo WRITE setFoo RESET resetFoo NOTIFY fooChanged)
+    } bar;
+)";
+    testDocuments << CppTestDocument::create("file.h", original, expected);
+
+    // Source File
+    testDocuments << CppTestDocument::create("file.cpp", {}, {});
+
+    GenerateGetterSetter factory;
+    QuickFixOperationTest(testDocuments, &factory, ProjectExplorer::HeaderPaths(), 4);
+}
+
 void QuickfixTest::testGenerateGetterSetterInlineInHeaderFile()
 {
     QList<TestDocumentPtr> testDocuments;