Visual glitch in Network view after adding squashed subtree

Description:
----------------
IMO there's a visual glitch / error after adding a sqashed subtree.

System Information:
---------------------------
Bitbucket version: 4.7.1
Browser: Chromium on Ubuntu 14.04 LTS

Steps to reproduce:
--------------------------

```
mkdir foo
cd foo
git init
echo "test" > text.txt
git add --all
git commit -m "Initial commit"
git add remote origin <path-to-server>
git push -u origin master
git subtree add --squash --prefix=cmake https://github.com/rpavlik/cmake-modules.git master
```

Go to the repository on Bitbucket server and click "Network".

Actual Result:
------------------
You should see something like this:

As you can see there is a gap in the red line.

Expected Result:
-----------------------
I would expect the red line to be continous.

PS: I would have fitead of a suggestion but due to some configuration issues I am not able to do so anymore. Would be great if you fixed this!