[gtk-doc] mkdb: log if there is no hierarchy file present

[Stefan Sauer <stefkost src gnome org>]

commit a202316cf9fe59f3ccf64c73ad49fcf6e045c7c7
Author: Stefan Sauer <ensonic users sf net>
Date:   Wed Aug 9 10:20:58 2017 +0200

    mkdb: log if there is no hierarchy file present

 gtkdoc/mkdb.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtkdoc/mkdb.py b/gtkdoc/mkdb.py
index e892a3b..933cca7 100644
--- a/gtkdoc/mkdb.py
+++ b/gtkdoc/mkdb.py
@@ -4425,6 +4425,7 @@ def ReadObjectHierarchy(ifile):
     ObjectLevels[:] = []
 
     if not os.path.isfile(ifile):
+        logging.debug('no *-hierarchy.tx')
         return
 
     INPUT = open(ifile)