Fix upload of bounding box only skeleton annotations (#6985)

CHANGELOG.unreleased.md

@@ -20,13 +20,14 @@ For upgrade instructions, please check the [migration guide](MIGRATIONS.released
 
 ### Changed
 - Moved the view mode selection in the toolbar next to the position field. [#6949](https://github.com/scalableminds/webknossos/pull/6949)
-- Redesigned welcome toast for new, annonymous users with new branding. [#6961](https://github.com/scalableminds/webknossos/pull/6961)
+- Redesigned welcome toast for new, anonymous users with new branding. [#6961](https://github.com/scalableminds/webknossos/pull/6961)
 
 ### Fixed
 - Fixed unintended dependencies between segments of different volume layers which used the same segment id. Now, using the same segment id for segments in different volume layers should work without any problems. [#6960](https://github.com/scalableminds/webknossos/pull/6960)
 - Fixed incorrect initial tab when clicking "Show Annotations" for a user in the user list. Also, the datasets tab was removed from that page as it was the same as the datasets table from the main dashboard. [#6957](https://github.com/scalableminds/webknossos/pull/6957)
 - Fixed that unsaved changes were shown when opening an annotation, although there weren't any. [#6972](https://github.com/scalableminds/webknossos/pull/6972)
 - Fixed misleading email about successful dataset upload, which was in some cases sent even for unusable datasets. [#6977](https://github.com/scalableminds/webknossos/pull/6977)
+- Fixed upload of skeleton annotations with no trees, only bounding boxes, being incorrectly rejected. [#6985](https://github.com/scalableminds/webknossos/pull/6985)
 
 ### Removed
 

app/models/annotation/nml/NmlParser.scala

@@ -95,7 +95,7 @@ object NmlParser extends LazyLogging with ProtoGeometryImplicits with ColorGener
           }
 
         val skeletonTracingOpt: Option[SkeletonTracing] =
-          if (treesSplit.isEmpty) None
+          if (treesSplit.isEmpty && userBoundingBoxes.isEmpty) None
           else
             Some(
               SkeletonTracing(