Fix bug about comment attachment (#11272)

Author: lunny

templates/repo/issue/view_content/comments.tmpl

@@ -52,10 +52,10 @@
 					</div>
 					<div id="comment-{{.ID}}" class="raw-content hide">{{.Content}}</div>
 					<div class="edit-content-zone hide" data-write="issuecomment-{{.ID}}-write" data-preview="issuecomment-{{.ID}}-preview" data-update-url="{{$.RepoLink}}/comments/{{.ID}}" data-context="{{$.RepoLink}}" data-attachment-url="{{$.RepoLink}}/comments/{{.ID}}/attachments"></div>
-				{{if .Issue.Attachments}}
+				{{if .Attachments}}
 					<div class="ui clearing divider"></div>
 					<div class="ui middle aligned padded grid">
-						{{template "repo/issue/view_content/attachments" Dict "ctx" $ "Attachments" .Issue.Attachments}}
+						{{template "repo/issue/view_content/attachments" Dict "ctx" $ "Attachments" .Attachments}}
 					</div>
 				{{end}}
 				</div>