SAPUI5 ObjectPageSubSection blocks update issue

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>SAPUI5 XMLCompsite aggregation factory binding issue</title>
	<script id="sap-ui-bootstrap"
		src="https://openui5.hana.ondemand.com/resources/sap-ui-core.js"
		data-sap-ui-theme="sap_belize"
		data-sap-ui-libs="sap.m, sap.ui.layout, sap.tnt"
		data-sap-ui-resourceroots='{"BlocksIssue": "./"}'
		data-sap-ui-bindingSyntax="complex"
		data-sap-ui-async="true">
	</script>
	<script>
		sap.ui.getCore().attachInit(function () {
			sap.ui.require([
				"sap/ui/core/mvc/XMLView"
			], function (XMLView) {
				XMLView.create({viewName: "BlocksIssue.App"}).then(function (oView) {
					oView.placeAt("content");
				});
			});
		});
	</script>
</head>
<body class="sapUiBody" id="content"></body>
</html>

# Reproduction steps

Use segmented buttons to switch between **blue** and **red** block in object page sub section.

# Issue

Switching blocks causes an error log message:

**Cannot remove aggregated child without aggregation name.**

Basically, this error message is not breaking the application but is confusing and leads to the assumption of invalid coding.

# Cause

The error message is logged by the _\_removeChild_ method of the _ManagedObject_ implementation due to missing _sAggregationName_ argument.
This missing argument seems to be originated in the overridden *addAggregation*
method of the *ObjectPageSubSection* implementation, where *setParent* is called
without an aggregation name argument:

```
ObjectPageSubSection.prototype.addAggregation = function (sAggregationName, oObject, bSuppressInvalidate) {
  ...

  if (this.hasProxy(sAggregationName)) {
    ...

    if (oObject instanceof BlockBase || ...) {
      // setParent called without aggregation name argument:
      oObject.setParent(this);
    }

    return this;
  }

  ...
};
```

sap.ui.define([
	"sap/ui/core/mvc/Controller",
	"BlocksIssue/BlockBlue",
	"BlocksIssue/BlockRed"
], function (Controller, BlockBlue, BlockRed) {
	"use strict";
	return Controller.extend("BlocksIssue.App", {

		onSelectionChange: function(oEvent) {
		  var sKey = oEvent.getSource().getSelectedKey();
		  var oSubSection = this.byId("subSection");
		  
		  oSubSection.destroyBlocks();
		  
		  var oNewBlock = sKey === "blue" ? new BlockBlue() : new BlockRed();
		  
		  oSubSection.addBlock(oNewBlock);
		}
		
	});
});

<mvc:View
	controllerName="BlocksIssue.App"
	displayBlock="true"
	xmlns:mvc="sap.ui.core.mvc"
	xmlns:core="sap.ui.core"
  xmlns:m="sap.m"
  xmlns:block="BlocksIssue"
	xmlns="sap.uxap">
	<m:App id="app">
	  <ObjectPageLayout enableLazyLoading="true">
	    <headerTitle>
      <ObjectPageDynamicHeaderTitle>
        <heading>
          <m:Title text="SAPUI5 ObjectPageSubSection blocks update issue" />
        </heading>
      </ObjectPageDynamicHeaderTitle>
    </headerTitle>
    <sections>
      <ObjectPageSection title="Section">
        <ObjectPageSubSection id="subSection">
          <actions>
            <m:SegmentedButton width="10rem" selectedKey="blue" selectionChange=".onSelectionChange">
					    <m:items>
						    <m:SegmentedButtonItem text="Blue" key="blue" />
						    <m:SegmentedButtonItem text="Red" key="red" />
					    </m:items>
				    </m:SegmentedButton>
          </actions>
          <blocks>
            <block:BlockBlue />
          </blocks>
        </ObjectPageSubSection>
      </ObjectPageSection>
    </sections>
	  </ObjectPageLayout>
	</m:App>
</mvc:View>

<mvc:View
		xmlns:mvc="sap.ui.core.mvc"
		xmlns:html="http://www.w3.org/1999/xhtml">
	<html:div style="height:4em; background-color: #A9EAFF ;" />
</mvc:View>

sap.ui.define(['sap/uxap/BlockBase'],
	function (BlockBase) {
		"use strict";

		var BlockBlue = BlockBase.extend("BlocksIssue.BlockBlue", {
			metadata: {
				views: {
					Collapsed: {
						viewName: "BlocksIssue.BlockBlue",
						type: "XML"
					},
					Expanded: {
						viewName: "BlocksIssue.BlockBlue",
						type: "XML"
					}
				}
			},
			renderer: {}
		});

		return BlockBlue;

	});

<mvc:View
		xmlns:mvc="sap.ui.core.mvc"
		xmlns:html="http://www.w3.org/1999/xhtml">
	<html:div style="height:4em; background-color: #EC7063 ;"/>
</mvc:View>

sap.ui.define(['sap/uxap/BlockBase'],
	function (BlockBase) {
		"use strict";

		var BlockRed = BlockBase.extend("BlocksIssue.BlockRed", {
			metadata: {
				views: {
					Collapsed: {
						viewName: "BlocksIssue.BlockRed",
						type: "XML"
					},
					Expanded: {
						viewName: "BlocksIssue.BlockRed",
						type: "XML"
					}
				}
			},
			renderer: {}
		});

		return BlockRed;

	});