Description of problem:
If user morphs one kind of task to another, validation assumes that new kind of task contains also attributes of old kind of task.

Version-Release number of selected component (if applicable):
jbds-9.1.0.CR1_jbdsis-9.0.0.CR1
jbtis-4.3.0.CR1

Steps to Reproduce:
1. Create new process
2. Add 'manual task' to canvas
3. Morph 'manual task' to 'script task' for example
4. Save process

Actual results:
There will be error, that 'script task' has no data type for 'Task Name' and 'Actor Id' which are not attributes of 'script task'

Expected results:
There will be not error, that 'script task' has no data type for 'Task Name' and 'Actor Id'