Fix the empty image of commit status 

**Describe the bug**
Gitploy displays the empty image for the commit status like the below screenshot. 

**Logs or Screenshots**

<details>
<summary>Screenshots</summary>

![image](https://user-images.githubusercontent.com/17633736/155836783-62891f20-79af-49d1-b14b-aeb64e0fb3f5.png)

</details>

