[lldb/Utility] Fix StructuredData::ParseJSONValue for null items

[mib]

Summary

This patch fixes the JSON parser for StructuredData to handle JSON null
entries.

Signed-off-by: Med Ismail Bennani <[e-mail]>

[JDevlieghere]

LGTM

[kastiglione]

+1

lldb/source/Utility/StructuredData.cpp

if (auto b = value.getAsBoolean())
     return std::make_shared<StructuredData::Boolean>(*b);
 
   if (auto i = value.getAsInteger())
     return std::make_shared<StructuredData::Integer>(*i);
 
   if (auto d = value.getAsNumber())
     return std::make_shared<StructuredData::Float>(*d);
 
+  if (auto n = value.getAsNull())
+    return std::make_shared<StructuredData::Null>();
+
   return StructuredData::ObjectSP();
 }
 
 static StructuredData::ObjectSP ParseJSONObject(json::Object *object) {
   auto dict_up = std::make_unique<StructuredData::Dictionary>();
   for (auto &KV : *object) {
     StringRef key = KV.first;
     json::Value value = KV.second;