Previous not populated when using --latest #3
Description
Describe the bug
When using "latest" previous is not set.
To Reproduce
Steps to reproduce the behavior:
Notes: experienced on PurpleBooth/git-mit, it has the config as defined below.
[changelog]
header = """## Changelog
"""
body = """
{% if version %}\
{% if previous %}\
### [{{ version }}](https://github.com/PurpleBooth/git-mit/compare/{{ previous.version }}...{{ version }}) ({{ timestamp | date(format="%Y-%m-%d") }})
{% else %}\
### [{{ version }}](https://github.com/PurpleBooth/git-mit/tree/{{ version }}) ({{ timestamp | date(format="%Y-%m-%d") }})
{% endif %}\
{% else %}\
### [unreleased]
{% endif %}\
{% if previous %}\
{% if previous.commit_id %}
[{{ previous.commit_id | truncate(length=7, end="") }}]({{ previous.commit_id }})...\
[{{ commit_id | truncate(length=7, end="") }}]({{ commit_id }})
{% endif %}\
{% endif %}\
{% for group, commits in commits | group_by(attribute="group") %}
### {{ group | upper_first }}
{% for commit in commits %}
- {{ commit.message | upper_first }} ([{{ commit.id | truncate(length=7, end="") }}]({{ commit.id }}))\
{% endfor %}
{% endfor %}\n
"""
trim = true
[git]
conventional_commits = true
tag_pattern = "v[0-9]*"Expected behavior
A clear and concise description of what you expected to happen.
I would expect previous to always be set, so we can correctly generate compare URLs for Github.
Screenshots/Logs
$ git-cliff | head
## Changelog
### [unreleased]
### Fix
- Update the changelog ([70bd7ff](70bd7ffe55857940e898f5b97b34b2f62acd1c8e))
### [v4.0.14](https://github.com/PurpleBooth/git-mit/compare/v4.0.13...v4.0.14) (2021-08-14)
[88ef7ec](88ef7ecd813d32f19804421acf3daa3e396d48e2)...[fb1afd9](fb1afd98c2c290fee748c89fde064667f49b8cda)$ git-cliff --latest | head
## Changelog
### [v4.0.14](https://github.com/PurpleBooth/git-mit/compare/...v4.0.14) (2021-08-14)
### Build
- Versio update versions ([fb1afd9](fb1afd98c2c290fee748c89fde064667f49b8cda))
### Chore
- Update FUNDING.yml ([651ef61](651ef61ed10923c6e451bd63dae4b038c845ad2e))
System (please complete the following information):
- OS Information: [e.g. Arch GNU/Linux x86_64 5.4.8-arch1-1]
- Project Version: [e.g. 0.1.0]
$ sw_vers
ProductName: macOS
ProductVersion: 11.5.1
BuildVersion: 20G80$ git-cliff --version
git-cliff 0.1.0Additional context
Add any other context about the problem here.