Summary: Set chart bounds to null to avoid returning wrong

chart size to report engine.(T55644)
    
Bugzilla Bug(s) Resolved:
    
Description:
Set chart bounds to null to avoid returning wrong
chart size to report engine.(T55644)

chart/org.eclipse.birt.chart.reportitem/src/org/eclipse/birt/chart/reportitem/ChartReportItemPresentationBase.java

@@ -865,18 +865,27 @@ public Object onRowSets( IBaseResultSet[] baseResultSet )
 			{
 				if ( bEmptyWithUncompletedBindings && isAutoHide( ) )
 				{
+					// Set bounds to null to avoid return wrong chart size to
+					// report engine.
+					boundsRuntime = null;
 					// Null result set
 					return outputNullResultSet( );
 				}
 				if ( bEmptyWithEmptyResultSet && isAutoHide( ) )
 				{
+					// Set bounds to null to avoid return wrong chart size to
+					// report engine.
+					boundsRuntime = null;
 					// Returns null for engine to display empty when the result
 					// set is empty.
 					return null;
 				}
 			}
 			if ( bEmptyData && isAutoHide( ) )
 			{
+				// Set bounds to null to avoid return wrong chart size to
+				// report engine.
+				boundsRuntime = null;
 				return null;
 			}