Fix branch name of discord message of nightly build #545
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Describe the pull
![image](https://private-user-images.githubusercontent.com/65698239/243234567-116ad012-716f-47b9-b32d-d52826433f83.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.K0BmLAaII_dpaYepv4BjrPUaU5Y9Uk90A3g51p7_gcc)
fix null-filled branch name
Additional context
![](https://camo.githubusercontent.com/97568670ec3112652151b6e6dabb53792ca19f8e5a9dc1624dd565f39b0788dc/68747470733a2f2f63646e2e646973636f72646170702e636f6d2f6174746163686d656e74732f313131353039323135373338353134363338382f313131353039353130383832383831313332352f696d6167652e706e67)
double {{ is needed