fix: lazyly create scope for typedef to class* (#109)

this is for the case when scope is a typedef to a pointer to a class
the test case using this is a class without definition

Author: Vipul-Cariappa

src/ProxyWrappers.cxx

@@ -579,6 +579,11 @@ PyObject* CPyCppyy::CreateScopeProxy(const std::string& name, PyObject* parent,
         parent = gThisModule;
         return CreateScopeProxy(klass, parent, flags);
     } else if (Cppyy::TCppScope_t klass = Cppyy::GetScope(name, parent_scope)) {
+        if (Cppyy::IsTypedefed(klass) &&
+            Cppyy::IsPointerType(Cppyy::GetTypeFromScope(klass)) &&
+            Cppyy::IsClass(Cppyy::GetUnderlyingScope(klass)) &&
+            !Cppyy::IsComplete(Cppyy::GetUnderlyingScope(klass)))
+            return nullptr; // this is handled by the caller; typedef to undefined class pointer
         return CreateScopeProxy(klass, parent, flags);
     } else if (Cppyy::IsBuiltin(name)) {
         Cppyy::TCppType_t type = Cppyy::GetType(name);