gerrit: don't fetch content for deleted files

Change-Id: I9275af0fe798e02f056ba70bd677f7178996d58e
diff --git a/gerrit/server.go b/gerrit/server.go
index e6e5409..e23200b 100644
--- a/gerrit/server.go
+++ b/gerrit/server.go
@@ -151,7 +151,10 @@
 		return nil, err
 	}
 
-	for name := range files {
+	for name, file := range files {
+		if file.Status == "D" {
+			continue
+		}
 		c, err := g.GetContent(changeID, revID, name)
 		if err != nil {
 			return nil, err