Fix issue with jsonpointer remove

Author: danielaparker

include/jsoncons_ext/jsonpointer/jsonpointer.hpp

@@ -799,6 +799,10 @@ namespace jsonpointer {
                        bool create_if_missing,
                        std::error_code& ec)
     {
+        if (location.empty())
+        {
+            return;
+        }
         Json* current = std::addressof(root);
 
         std::basic_string<typename Json::char_type> buffer;
@@ -940,6 +944,7 @@ namespace jsonpointer {
     {
         if (location.empty())
         {
+            ec = jsonpointer_errc::expected_location;
             return;
         }
 
@@ -1047,6 +1052,11 @@ namespace jsonpointer {
                  bool create_if_missing,
                  std::error_code& ec)
     {
+        if (location.empty())
+        {
+            root = std::forward<T>(value);
+            return;
+        }
         Json* current = std::addressof(root);
 
         std::basic_string<typename Json::char_type> buffer;

include/jsoncons_ext/jsonpointer/jsonpointer_error.hpp

@@ -55,7 +55,8 @@ enum class jsonpointer_errc
     unexpected_end_of_input,
     argument_to_unflatten_invalid,
     invalid_flattened_key,
-    invalid_uri_escaped_data
+    invalid_uri_escaped_data,
+    expected_location
 };
 
 class jsonpointer_error_category_impl
@@ -92,6 +93,8 @@ class jsonpointer_error_category_impl
                 return "Argument to unflatten must be an object";
             case jsonpointer_errc::invalid_flattened_key:
                 return "Flattened key is invalid";
+            case jsonpointer_errc::expected_location:
+                return "Expected location";
             default:
                 return "Unknown jsonpointer error";
         }