Bug 122850 Table/list should not be able to be inserted in Master Page mode.
Description: Table/list should not be able to be inserted in Master Page mode. Steps to reproduce: 1. New a report and transfer to Master Page mode. 2. New a datasource and dataset 3. Drag a list/table to page header/footer, bind it to dataset and drag some columns inside. 4. Save and preview Expected result: Insert list/table item in master page should be forbidden. Actual result: They are allowed and preview showed "undefine" in page
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/elements/SemanticError.java
|| sResourceKey == DESIGN_EXCEPTION_INVALID_STRUCTURE_REF )
		{
			assert oaMessageArguments != null;
			return ModelMessages.getMessage( sResourceKey, new String[]{
					element.getName( ), (String) oaMessageArguments[0],
					(String) oaMessageArguments[1]} );
		}
		else if ( sResourceKey == DESIGN_EXCEPTION_DUPLICATE_GROUP_NAME
				|| sResourceKey == DESIGN_EXCEPTION_EXTENSION_NOT_FOUND )
		{
			assert oaMessageArguments != null;
			return ModelMessages.getMessage( sResourceKey, new String[]{
					element.getName( ), (String) oaMessageArguments[0]} );
		}
		else if ( sResourceKey == DESIGN_EXCEPTION_IMAGE_FILE_NOT_EXIST
				|| sResourceKey == DESIGN_EXCEPTION_INVALID_PROPERTY_NAME )
		{
			assert oaMessageArguments != null;
			return ModelMessages.getMessage( sResourceKey, new String[]{
					(String) oaMessageArguments[0], element.getName( )} );
		}
		else if ( sResourceKey == DESIGN_EXCEPTION_INVALID_CUSTOM_COLOR_NAME
				|| sResourceKey == DESIGN_EXCEPTION_DUPLICATE_CUSTOM_COLOR_NAME
				|| sResourceKey == DESIGN_EXCEPTION_PROPERTY_COPY_FORBIDDEN )
		{
			assert oaMessageArguments != null;
			return ModelMessages.getMessage( sResourceKey,
					new String[]{(String) oaMessageArguments[0]} );
		}
		else if ( sResourceKey == DESIGN_EXCEPTION_OVERLAPPING_CELLS )