Oracle SQL Statement problem -- unable to list glossary entries

While trying to use the auto-linking functionality with the glossary, I got nothing.....
When looking into code, I found a bug ; it seems to be relative to Oracle
The clause: != \'\' appears to not working under my Oracle....???
And obviously is not null does (but does not test the same).

Another problem shows up after it, when having aliases without entries or categories, the array_merge with a null array fails !

I've modified this in the joined file. Here's the diff lines:
73,74c73,74
< AND ge.concept != \'\' ');
<
—
> AND ge.concept is not null '); //Joseph Boiteau: previous sql isn't working with Oracle
> // and moreover, the string could'nt be emptyl using interface
85c85,86
< if ($aliases) {
—
> // Joseph Boiteau: adding controls to not use a null $concepts object
> if ($aliases and $concepts) {
87a89,91
> elseif ($aliases)

Should I commit that somewhere ?
Is it a bad sql or an Oracle abnormal comportment ?

It's working here but I don't know what to do with that !