CppunitTest_desktop_lib: close the document while LOK is still active

Otherwise the LOK notifiers won't be released (since LOK is not active),
and we leak vcl::Windows in GetLOKWindowsMap()::s_pLOKWindowsMap.

In dbgutil builds, this leads to an assertion failure if the sidebar is
active.

(cherry picked from commit da17ccae)

On cp-6.0, this is a regression from the cp-6.0-only commit
49fe72fe (sfx2: LOK: route the parent
sidebar window instead of the deck, 2018-10-10).

Conflicts:
	desktop/qa/desktop_lib/test_desktop_lib.cxx

Change-Id: Idedb9578478ff4a9f2e17c0cfd203da6f007bdbd
Reviewed-on: https://gerrit.libreoffice.org/72098Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>

desktop/source/lib/init.cxx

@@ -87,6 +87,7 @@
 #include <com/sun/star/linguistic2/LinguServiceManager.hpp>
 #include <com/sun/star/linguistic2/XSpellChecker.hpp>
 #include <com/sun/star/i18n/ScriptType.hpp>
+#include <com/sun/star/lang/DisposedException.hpp>
 
 #include <editeng/fontitem.hxx>
 #include <editeng/flstitem.hxx>
@@ -916,7 +917,14 @@ LibLODocument_Impl::LibLODocument_Impl(const uno::Reference <css::lang::XCompone
 
 LibLODocument_Impl::~LibLODocument_Impl()
 {
-    mxComponent->dispose();
+    try
+    {
+        mxComponent->dispose();
+    }
+    catch (const css::lang::DisposedException& rException)
+    {
+        SAL_WARN("lok", "failed to dispose document:" << rException.Message);
+    }
 }
 
 CallbackFlushHandler::CallbackFlushHandler(LibreOfficeKitDocument* pDocument, LibreOfficeKitCallback pCallback, void* pData)