Also add a defensive guard against malformed claps. In clap in

bitwig resizing a destroyed gui would post a misbehaving error
but in the vst3 we would crash absent this guard. Just a defensive
check.

src/wrapasvst3.cpp

@@ -955,7 +955,10 @@ bool ClapAsVst3::gui_can_resize()
 
 bool ClapAsVst3::gui_request_resize(uint32_t width, uint32_t height)
 {
-  return _wrappedview->request_resize(width, height);
+  if (_wrappedview)
+    return _wrappedview->request_resize(width, height);
+  else
+    return false;
 }
 
 bool ClapAsVst3::gui_request_show()