Pipeline graph line links do not meet up with every process for stage

Summary

Pipeline graph line links do not meet up with every process for stage. Instead they are just left "floating".

• Gitlab Version: 8.13.1
• OS: Debian Jesse 8
• Gitlab CI Runner: Windows Based Runner 1.7

Steps to reproduce

1. Go to any CI enabled project
2. Navigate to Pipelines
3. Click on a build with multiple stages

Expected behavior

The links between stages to meet up with every process

Actual behavior

The links do not match up with all processes

Relevant logs and/or screenshots