dap/client.cpp: Use QJsonObject instead of null
GDB has now dap
interpreter, however it did not work with Kate due to the request being wrong.
I asked in their mailing list if it's a bug in GDB DAP or Kate here: https://sourceware.org/pipermail/gdb/2024-January/051058.html
Instead of sending null request, send object in the request. This makes GDB with dap
interpreter work. It is also how the request should be made in the first place: Some debug adapters do not care if it's null or object, but may as well return the correct value.
Edited by Akseli Lahtinen