Error creating a new task using EDS if "All" category is selected

[James D]

Binary package hint: tasque

When using the Tasque in conjunction with Evolution, if the category dropdown is set on "All", attempting to add a new task will result in the error message, "Error creating a new task" in the status bar, and "[Debug]: Error creating a new task!" in the console.

This is bad for two reasons:
1) Neither of these errors tells the user how to fix them.
2) This behavior is inconsistent with the Local File management system.

Tasque should either default to the last used category if "All" is selected and the user tries to enter a new task, or provide a more helpful error message.