fdo#53592: Try not to crash on empty m_ZipContent

Change-Id: I9bdc9997e260a75682177c8641695b60df0c81a6

shell/source/win32/ooofilereader/basereader.cxx

@@ -81,9 +81,12 @@ void CBaseReader::Initialize( const std::string& ContentName)
         if (m_ZipContent.empty())
             m_ZipFile.GetUncompressedContent( ContentName, m_ZipContent );
 
-        xml_parser parser;
-        parser.set_document_handler(this);  // pass current reader as reader to the sax parser
-        parser.parse(&m_ZipContent[0], m_ZipContent.size());
+        if (!m_ZipContent.empty())
+        {
+            xml_parser parser;
+            parser.set_document_handler(this);  // pass current reader as reader to the sax parser
+            parser.parse(&m_ZipContent[0], m_ZipContent.size());
+        }
     }
     catch(std::exception&
     #if OSL_DEBUG_LEVEL > 0

shell/source/win32/zipfile/zipfile.cxx

@@ -261,6 +261,8 @@ static bool areHeadersConsistent(const LocalFileHeader &header, const CentralDir
 
 static bool findCentralDirectoryEnd(StreamInterface *stream)
 {
+    if (!stream)
+        return false;
     stream->sseek(0, SEEK_SET);
     try
     {
@@ -483,7 +485,7 @@ void ZipFile::GetUncompressedContent(
             ContentBuffer.clear();
             return;
         }
-		(void)inflateEnd(&strm);
+        (void)inflateEnd(&strm);
     }
 }