Created attachment 628017 [details]
Record of steps to reproduce

Description of problem:
Cannot save a process when set task property ("Task Name") to string with "&" (for example: A & B)

Version-Release number of selected component (if applicable):
BRMS 5.3.1 ER3, designer 2.3.1-dev

How reproducible:
every time when property "Task Name" contains "&"

Steps to Reproduce:
1. create new BPMN2 asset
2. create proces (Start->Task->End)
3. click on Task, show Property Bar
4. set property "Task Name" to "A & B"
5. validate process (it is  OK)
6. save it
  
Actual results:
Alert "Unable to perform user action due to error(s).
Validate your process before saving, and view server logs to see error details."

Server.log: 
-> ERROR [STDERR] (http-127.0.0.1-8080-31) org.eclipse.emf.ecore.resource.Resource$IOWrappedException: The reference to entity "B" must end with the ';' delimiter.

-> ERROR [org.jbpm.designer.web.profile.impl.JbpmProfileImpl] (http-127.0.0.1-8080-31) java.lang.NullPointerException

Expected results:
The validator catches invalid form of property "Task Name" and save process will be ignore this problem.

Additional info: