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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.cshVQ7BmQmVpsW1spgcxPHZCjRiMcA1nuKgl8NVoPmY)
fix null-filled branch name
Additional context
![](https://camo.githubusercontent.com/3630e9375dc70aa8eafa234f02e4ce90a0126d6ab13470918dcf0ba9bf04169b/68747470733a2f2f63646e2e646973636f72646170702e636f6d2f6174746163686d656e74732f313131353039323135373338353134363338382f313131353039353130383832383831313332352f696d6167652e706e67)
double {{ is needed