fix: check if non-synthetic exists

Co-authored-by: Michael Buch <michaelbuch12@gmail.com>

Author: Nerixyz

lldb/source/Plugins/Language/CPlusPlus/MsvcStlSmartPointer.cpp

@@ -15,8 +15,10 @@
 using namespace lldb;
 
 bool lldb_private::formatters::IsMsvcStlSmartPointer(ValueObject &valobj) {
-  ValueObjectSP valobj_sp = valobj.GetNonSyntheticValue();
-  return valobj_sp->GetChildMemberWithName("_Ptr") != nullptr;
+  if (auto valobj_sp = valobj.GetNonSyntheticValue())
+    return valobj_sp->GetChildMemberWithName("_Ptr") != nullptr;
+
+  return false;
 }
 
 bool lldb_private::formatters::MsvcStlSmartPointerSummaryProvider(