Fix a couple of issues with a feeds (#14897)

@CirnoT spotted a couple of issues with feeds on discord.

This PR fixes both of these.

modules/templates/helper.go

@@ -817,6 +817,10 @@ func ActionIcon(opType models.ActionType) string {
 func ActionContent2Commits(act Actioner) *repository.PushCommits {
 	push := repository.NewPushCommits()
 
+	if act == nil || act.GetContent() == "" {
+		return push
+	}
+
 	json := jsoniter.ConfigCompatibleWithStandardLibrary
 	if err := json.Unmarshal([]byte(act.GetContent()), push); err != nil {
 		log.Error("json.Unmarshal:\n%s\nERROR: %v", act.GetContent(), err)

templates/user/dashboard/feeds.tmpl

@@ -110,7 +110,8 @@
 						<span class="text truncate issue title">{{index .GetIssueInfos 1 | RenderEmoji}}</span>
 					{{else if or (eq .GetOpType 10) (eq .GetOpType 21) (eq .GetOpType 22) (eq .GetOpType 23)}}
 						<a href="{{.GetCommentLink}}" class="text truncate issue title">{{.GetIssueTitle | RenderEmoji}}</a>
-						<p class="text light grey">{{index .GetIssueInfos 1 | RenderEmoji}}</p>
+						{{$comment := index .GetIssueInfos 1}}
+						{{if gt (len $comment) 0}}<p class="text light grey">{{$comment | RenderEmoji}}</p>{{end}}
 					{{else if eq .GetOpType 11}}
 						<p class="text light grey">{{index .GetIssueInfos 1}}</p>
 					{{else if or (eq .GetOpType 12) (eq .GetOpType 13) (eq .GetOpType 14) (eq .GetOpType 15)}}