Make helpcompiler more verbose on dot ahelps

Currently we get a warning if the ahelp is one dot
and there was no previous bookmark tag.

This warning contains only the text with the problemmatic ahelp.

It would make it easier to hunt down such problems if we would
know the file names.

This patch does that, and now I see 334 problems in 137 files.

Change-Id: I364368f7affb85d5c5d526dd4674757c51956aea
Reviewed-on: https://gerrit.libreoffice.org/38044Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>

helpcompiler/source/HelpCompiler.cxx

@@ -417,7 +417,7 @@ void myparser::traverse( xmlNodePtr parentNode )
             {
                 //TODO: make these asserts and flush out all our broken help ids
                 SAL_WARN_IF(hidstr.empty(), "helpcompiler", "hid='' for text:" << text);
-                SAL_WARN_IF(!hidstr.empty() && extendedHelpText.empty(), "helpcompiler", "hid='.' with no hid bookmark branches for text:" << text);
+                SAL_WARN_IF(!hidstr.empty() && extendedHelpText.empty(), "helpcompiler", "hid='.' with no hid bookmark branches in file: " << fileName + " for text: " << text);
                 HashSet::const_iterator aEnd = extendedHelpText.end();
                 for (HashSet::const_iterator iter = extendedHelpText.begin(); iter != aEnd; ++iter)
                 {