Fixed a bug that can occur when an identifier weakness maps to a task nu...

Fixed a bug that can occur when an identifier weakness maps to a task number which is shared with an in-scope custom task.

i.e. weakness XYZ maps to task 888. If CT888 exists in the project tasks then we will attempt to add a note to project task T888. If the task exists we'll get duplicate notes. If the task doesn't exist in the project we will get a 404 error.