Fix crashes under win32

Signed-off-by: falkTX <falktx@falktx.com>

dgl/src/WindowPrivateData.cpp

@@ -574,7 +574,9 @@ void Window::PrivateData::onPuglConfigure(const double width, const double heigh
 
     const uint uwidth = static_cast<uint>(width + 0.5);
     const uint uheight = static_cast<uint>(height + 0.5);
-    self->onReshape(uwidth, uheight);
+
+    if (self != nullptr)
+        self->onReshape(uwidth, uheight);
 
 #ifndef DPF_TEST_WINDOW_CPP
     if (topLevelWidget != nullptr)

dgl/src/pugl-upstream

@@ -1 +1 @@
-Subproject commit 5a4d2469a72ad072a0e2397477a2cd701c2ca309
+Subproject commit c5a5eb4cdcb12dc8d74be4f5fbb335e8b3eac711