Intersect annotations does not work if an annotation group consists of digits only

Scenario:

1. Open the WD.
2. Run sample workflow "Intersect annotations" from the "Scenarios" section with "a.gb" and "b.gb" input files (see the attachment to this issue).
   Expected result: the workflow has been finished successfully, "intersect.gb" file is created.
   Current result: the workflow has been finished with an error:

   Result document is NULL
   

   There is stderr output like this:

   Error: Invalid record in file /var/folders/0l/nvxqy6vn35s9y87800qgsr6c0000gp/T/ugene_tmp/p74459/intersect_annotations/A-D74459.gff. Record is 
   Annotations	-0	18	14	41	.	.	.	name=annA
   

The problem is that in "a.gb" file "/ugene_group=18".