tdf#119155, tdf#119162: check there's at least 1 word in Capitalize Every Word

See https://bugs.documentfoundation.org/show_bug.cgi?id=119155#c4
+ https://bugs.documentfoundation.org/attachment.cgi?id=144036

Change-Id: Id2cb05b3c83069b031a8be73cf0a4ec774d94d7e
Reviewed-on: https://gerrit.libreoffice.org/58750Tested-by: Julien Nabet <serval2412@yahoo.fr>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

editeng/source/editeng/impedit4.cxx

@@ -2756,7 +2756,7 @@ EditSelection ImpEditEngine::TransliterateText( const EditSelection& rSelection,
             }
 
             i18n::Boundary aCurWordBndry( aSttBndry );
-            while (aCurWordBndry.startPos <= aEndBndry.startPos)
+            while (aCurWordBndry.endPos && aCurWordBndry.startPos <= aEndBndry.startPos)
             {
                 nCurrentStart = aCurWordBndry.startPos;
                 nCurrentEnd   = aCurWordBndry.endPos;