6203: Apply special case only to a 0-byte manifest: don't ignore white space.

diff --git a/services/api/app/models/collection.rb b/services/api/app/models/collection.rb
index 95154c79cab8387be3c5ba42679bfb1934017f00..c4740f96eb4373552ef15130187750fc3b6812ce 100644 (file)
--- a/services/api/app/models/collection.rb
+++ b/services/api/app/models/collection.rb
@@ -213,7 +213,7 @@ class Collection < ArvadosModel
     # for each locator. Return a new manifest in which each locator
     # has been replaced by the block's return value.
     return nil if !manifest
-    return '' if !manifest.present?
+    return '' if manifest == ''
 
     new_lines = []
     lines = manifest.split("\n")