Found no commit for workflow_dispatch event

[gitfool]

i.e. when manually triggering a workflow. See workflow_dispatch.

[dhsh244]

Hi,

Adding onto the 'workflow_dispatch' event, this also happens while drafting a release manually.
When a workflow is triggered using event-type "release".

Sorry for assuming things but working on this issue might go hand-in-hand with the below mentioned issue as well,
#76

as 'commit' is being used to process a 'comment'

cobertura-action/src/action.js

Line 59 in 717143c

const comment = markdownReport(reports, commit, {