bug: fix wrong poster message for code comment on Pull view (#11721)

As title, maybe fix one of issue in #11705

Signed-off-by: a1012112796 <1012112796@qq.com>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

templates/repo/issue/view_content/comments.tmpl

@@ -475,13 +475,19 @@
 										{{range $comms}}
 											{{ $createdSubStr:= TimeSinceUnix .CreatedUnix $.Lang }}
 											<div class="comment" id="{{.HashTag}}">
+												{{if not .OriginalAuthor }}
 													<a class="avatar">
 														<img src="{{.Poster.RelAvatarLink}}">
 													</a>
+												{{end}}
 												<div class="content">
 													<div class="code-comment-content">
 														<span class="text grey">
+															{{if .OriginalAuthor }}
+																<span class="text black"><i class="fa {{MigrationIcon $.Repository.GetOriginalURLHostname}}" aria-hidden="true"></i> {{ .OriginalAuthor }}</span><span class="text grey"> {{if $.Repository.OriginalURL}}</span><span class="text migrate">({{$.i18n.Tr "repo.migrated_from" $.Repository.OriginalURL $.Repository.GetOriginalURLHostname | Safe }}){{end}}</span>
+															{{else}}
 																<a class="author"{{if gt .Poster.ID 0}} href="{{.Poster.HomeLink}}"{{end}}>{{.Poster.GetDisplayName}}</a>
+															{{end}}
 															{{$.i18n.Tr "repo.issues.commented_at" .HashTag $createdSubStr | Safe}}
 															<div class="text">
 																<div class="render-content markdown">