[birt-dev] Checkin: Fix chart type conversion exception and center the p

["Nina Li" <nli@xxxxxxxxxxx>]

-Summary: Fix chart type conversion exception and center the pop-up dialogs.

- SCR(s) Resolved: None

-Description:
1. In the chart builder, switch the chart type from scatter to stock, NullPointerException throws out.
The exception is caused by the conflict of default series outline visibility between the 2 types of charts.
2. Centered the 'Dial Ticks' and 'Dial Scale' dialogs on the screen instead of positioning them besides the main wizard pane.

- Regression (Yes / No): No

- Tests: Yes

- Test Automated: No

- Case Entries Resolved: N/A

- Notes to Developers: N/A

- Notes to QA: N/A

- Notes to Documentation: N/A

- Notes to Configuration Management: N/A

- Notes to Support: N/A

- Notes to Product Marketing: N/A

/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/DialScaleDialog.java
/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/DialTicksDialog.java
/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/type/StockChart.java

Regards,

Nina