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

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MKJf48vnGtTE25KscmjfaW
Signed-off-by: Niels Lohmann <niels.lohmann@gmail.com>

single_include/nlohmann/json.hpp

@@ -42793,7 +42793,6 @@ public:
 
             switch (parent.m_data.m_type)
             {
-                case value_t::null:
                 case value_t::object:
                 {
                     // use operator[] to add value
@@ -42825,6 +42824,7 @@ 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: