Throw out_of_range.411 for JSON Patch add into a null parent (#5917) (#5918)

Claude-Session: https://claude.ai/code/session_01MKJf48vnGtTE25KscmjfaW

Signed-off-by: Niels Lohmann <niels.lohmann@gmail.com>
Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>

include/nlohmann/json.hpp

@@ -7003,7 +7003,6 @@ public:
 
             switch (parent.m_data.m_type)
             {
-                case value_t::null:
                 case value_t::object:
                 {
                     // use operator[] to add value
@@ -7035,6 +7034,7 @@ public:
 
                 // the parent of an "add" target must be an object or array
                 // (see #4292)
+                case value_t::null:
                 case value_t::string:
                 case value_t::boolean:
                 case value_t::number_integer: