Description of problem:
In such case the "x" or "y" attribute of Bounds element in BPMNDiagram section is omitted, however these attributes are required as seen here https://github.com/worktokenteam/worktoken/blob/master/bpmn/DC.xsd. Having such process in the project produces error log messages on each project build:

11:01:11,187 ERROR [org.drools.core.xml.ExtensibleXmlParser] (pool-13-thread-1) (null: 58, 48): cvc-complex-type.4: Attribute 'x' must appear on element 'dc:Bounds'.

Version-Release number of selected component (if applicable):
ER7

How reproducible:
-

Steps to Reproduce:
1. open existing process
2. move Start node to the left border of designer canvas
3. save the process (error is logged)
4. build the project to repeat the error message in server log

Actual results:
"x" attribute in Bounds element related to the start node is missing. XML validation error is logged.

Expected results:
"x" attribute should be present and set to "0.0" to keep the process XML valid.