unlock export locks, if error occurs during export

The export sets 2 locks:

• one in LEK_tasks
• one in editorImportedTasks- folder
  Both of them should be removed automatically, if an error occurs during export of a task.

This can be done as follows:

• type UPDATE `translate5`.`LEK_task` SET `exportRunning` = NULL;
  and press enter
• open the folder c:\xampp\htdocs\translate5\editorImportedTasks\YOUR_TASK_GUID (whereas YOUR_TASK_GUID is the GUID of your task
• in this folder delete another subfolder with the same taskGuid, if it exists. The path of the subfolder to delete should look like this:
  c:\xampp\htdocs\translate5\editorImportedTasks\YOUR_TASK_GUID\YOUR_TASK_GUID
  NEVER delete the folder c:\xampp\htdocs\translate5\editorImportedTasks\YOUR_TASK_GUID\ or something else inside this folder.