Don't return an empty C string, the caller is not prepared for that

If the caller receives a pointer to an empty C string, it will send
the message "commandvalues: " to the JavaScript bits. That will cause
an exception as it expects JSON after the commandvalues: keyword.

Instead return a nullptr. The caller is prepared to handle that.

Change-Id: Ia1efa967668ba518993edb7945f064758b660b96

1 files changed, 3 insertions, 0 deletions

diff --git a/desktop/source/lib/init.cxx b/desktop/source/lib/init.cxx
index 78c3d27474ed..160ac0d68749 100644
--- a/desktop/source/lib/init.cxx
+++ b/desktop/source/lib/init.cxx
@@ -3568,6 +3568,9 @@ static char* doc_getCommandValues(LibreOfficeKitDocument* pThis, const char* pCo
         }
 
         OUString aHeaders = pDoc->getRowColumnHeaders(aRectangle);
+        if (aHeaders == "")
+            return nullptr;
+
         OString aString = OUStringToOString(aHeaders, RTL_TEXTENCODING_UTF8);
 
         char* pMemory = static_cast<char*>(malloc(aString.getLength() + 1));