fix by review comment

src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala

@@ -1140,7 +1140,7 @@ trait RepositoryViewerControllerBase extends ControllerBase {
     filename: String,
     repository: RepositoryService.RepositoryInfo,
     path: String
-  ): Unit = {
+  ) = {
     def archive(archiveFormat: String, archive: ArchiveOutputStream)(
       entryCreator: (String, Long, Int) => ArchiveEntry
     ): Unit = {
@@ -1194,6 +1194,7 @@ trait RepositoryViewerControllerBase extends ControllerBase {
             entry
           }
         }
+        ()
       case tarRe(compressor) =>
         response.setHeader("Content-Disposition", s"attachment; filename=${filename}")
         contentType = "application/octet-stream"
@@ -1215,6 +1216,7 @@ trait RepositoryViewerControllerBase extends ControllerBase {
             }
           }
         }
+        ()
       case _ =>
         BadRequest()
     }

src/main/scala/gitbucket/core/util/JGitUtil.scala

@@ -1253,7 +1253,7 @@ object JGitUtil {
           f(in)
         }
       } else {
-        throw new RuntimeException
+        throw new EmptyLfsAttributesException
       }
     } else {
       using(loader.openStream()) { in =>
@@ -1276,4 +1276,7 @@ object JGitUtil {
 
     JGitUtil.getLfsObjects(text)
   }
+
+  case class EmptyLfsAttributesException() extends Exception
+
 }

src/main/twirl/gitbucket/core/repo/files.scala.html

@@ -33,7 +33,7 @@
     <div class="head" style="height: 24px;">
       <div class="pull-right">
         <div class="btn-group">
-          <a href="@{helpers.url(repository)}/archive/@{helpers.encodeRefName(branch)}@if(pathList.length > 0){/@pathList.mkString("/")}/@{helpers.encodeRefName(branch)}.zip" class="btn btn-sm btn-default"><i class="octicon octicon-cloud-download"></i> Download ZIP</a>
+          <a href="@{helpers.url(repository)}/archive/@{helpers.encodeRefName(branch)}@if(pathList.length > 0){/@pathList.mkString("/")}/@{helpers.encodeRefName(branch)}.zip" class="btn btn-sm btn-default pc"><i class="octicon octicon-cloud-download"></i> Download ZIP</a>
           <a href="@helpers.url(repository)/find/@helpers.encodeRefName(branch)" class="btn btn-sm btn-default" data-hotkey="t"><i class="octicon octicon-search"></i></a>
           <a href="@helpers.url(repository)/commits/@helpers.encodeRefName((branch :: pathList).mkString("/"))" class="btn btn-sm btn-default"><i class="octicon octicon-history"></i> @if(commitCount > 10000){10000+} else {@commitCount} @helpers.plural(commitCount, "commit")</a>
         </div>