fdo#80580: LO crashes while opening the document on ubuntu build

Problem Description:
This issue is reproducible.

Step to reproduce :
1. Create .docx contains page break on first page.
2. Second page contains '&'(ampersand) with some character like 'x','z','#' etc.
3. Changes the size or font of '&character' which is on second page.
4. Precaution will be take all this i.e page break and '&character' contains in single paragraph'.

Solution:
Added a check for Context Type which must be CONTEXT_CHARACTER for deferring character.

Change-Id: I27989d2ca8d62fbd9efafe5ba7f4a65d56467c1e
Reviewed-on: https://gerrit.libreoffice.org/10532Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
Tested-by: Luboš Luňák <l.lunak@collabora.com>

writerfilter/source/dmapper/DomainMapper_Impl.cxx

@@ -1190,8 +1190,9 @@ void DomainMapper_Impl::appendTextPortion( const OUString& rString, PropertyMapP
 
     if (m_aTextAppendStack.empty())
         return;
-
-    if( pPropertyMap == m_pTopContext && !deferredCharacterProperties.empty())
+    // Before placing call to processDeferredCharacterProperties(), TopContextType should be CONTEXT_CHARACTER
+    // processDeferredCharacterProperties() invokes only if character inserted
+    if( pPropertyMap == m_pTopContext && !deferredCharacterProperties.empty() && (GetTopContextType() == CONTEXT_CHARACTER) )
         processDeferredCharacterProperties();
     uno::Reference< text::XTextAppend >  xTextAppend = m_aTextAppendStack.top().xTextAppend;
     if(xTextAppend.is() && ! getTableManager( ).isIgnore())