[gnote] Use text_content from NoteBase when no buffer

[Aurimas Černius <aurimasc src gnome org>]

commit e8f2134aba9d7d03a7e6b0529f6079a0a2e96e90
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sat Jul 11 19:08:45 2020 +0300

    Use text_content from NoteBase when no buffer

 src/note.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/note.cpp b/src/note.cpp
index 73052d1d..b06990a4 100644
--- a/src/note.cpp
+++ b/src/note.cpp
@@ -669,7 +669,7 @@ namespace gnote {
   Glib::ustring Note::text_content()
   {
     if(!m_buffer) {
-      get_buffer();
+      return NoteBase::text_content();
     }
     return m_buffer->get_slice(m_buffer->begin(), m_buffer->end());
   }