Fix activity plugin when 0 commits are pushed

source/plugins/activity/index.mjs

@@ -121,8 +121,8 @@ export default async function({login, data, rest, q, account, imports}, {enabled
             //Pushed commits
             case "PushEvent": {
               let {size, commits, ref} = payload
-              if (commits[commits.length - 1].message.startsWith("Merge branch "))
-                commits = [commits[commits.length - 1]]
+              if (commits.slice(-1).pop()?.message.startsWith("Merge branch "))
+                commits = commits.slice(-1)
               return {type:"push", actor, timestamp, repo, size, branch:ref.match(/refs.heads.(?<branch>.*)/)?.groups?.branch ?? null, commits:commits.reverse().map(({sha, message}) => ({sha:sha.substring(0, 7), message}))}
             }
             //Released