Description of problem:
Warning "Error enabling ajax action execution: NullPointerException" is shown when editting KPI panel content.

This problem seems to occur in firefox (both 17 and 24) and I also saw it when using Internet Explorer 11. It seems to happen only in Product (not in community version)

Version-Release number of selected component (if applicable):
BPMS 6.0.0 CR2

How reproducible:
Always in BPMS 6.0.0 CR2 + using firefox as a browser.

I tried to reproduce it in community version of dashbuilder - there is seems to work correctly (No NPEs trown). But I can reproduce it in 100% of cases after few tries of switching KPI chart type / KPI renderer in BPMS product.

Steps to Reproduce:
1. In BPMS product > dashbuilder navigate to workspace Showcase > page with some KPI
2. Open KPI panel editor (options > Edit content for some KPI)
3. Try switching between Chart types (Bar, Pie, Line chart) and choosing different renderer (NVD3 / Open Flash Chart)

Actual results:
Exception in server log (see attachment for full stack trace)

Error enabling ajax action execution: : java.lang.NullPointerException
at org.jboss.dashboard.ui.components.panelManagement.PanelManagementPanel.afterRenderComponent(PanelManagementPanel.java:103) [dashboard-ui-core-6.0.2-redhat-2.jar:]
at org.jboss.dashboard.ui.taglib.factory.UseComponentTag.doEndTag(UseComponentTag.java:48) [dashboard-ui-core-6.0.2-redhat-2.jar:]
at org.apache.jsp.components.modalDialogComponent.show_jsp._jspService(show_jsp.java:443)

Expected results:
No exception

Additional info:
I'm setting severity as low, because it seems, the functionality of application is not influenced by this NPE.