Fix EZP-23497: allow user de-selection when editing multiplexer workflow.
Fix EZP-23480: Error in json response when uploading file
Fix EZP-23530 Shipping VAT value is not taken into account
Remove test image
Merge pull request #1098 from trolek/fix-EZP-23530

Fix EZP-23530 Shipping VAT value is not taken into account
Merge pull request #1100 from guillaumelecerf/cleanup_after_tests

Remove test image
Fix EZP-23527: ezdatetime with no default value causes class edit to fail

According to the other datatypes I have checked, it should return an empty array in this case.
Merge pull request #1101 from glye/ezp-23527_ezdatetime_class_edit_fail

Fix EZP-23527: ezdatetime with no default value causes class edit to fai...
Merge pull request #1095 from joaoinacio/EZP-23497_multiplexer_edit_users

Fix EZP-23497: allow user de-selection when editing multiplexer workflow
Merge pull request #1096 from joaoinacio/EZP-23480_ezajaxupload_error

Fix EZP-23480: Error in json response when uploading file