[library-web] only create directory for existing documentation tarballs

[Frederic Peters <fpeters src gnome org>]

commit e630e894e24e6855c1c33579436f05f271a820cb
Author: Frédéric Péters <fpeters 0d be>
Date:   Sun Feb 11 15:07:26 2018 +0100

    only create directory for existing documentation tarballs

 src/modtypes/gtkdoc.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/modtypes/gtkdoc.py b/src/modtypes/gtkdoc.py
index 8bd5cba..0dc782a 100644
--- a/src/modtypes/gtkdoc.py
+++ b/src/modtypes/gtkdoc.py
@@ -133,11 +133,11 @@ class GtkDocModule(DocModule):
                             htmlfiles_dir = os.path.join(ext_dirname, 'doc-tarballs', self.dirname, 'html')
                             if not os.path.exists(htmlfiles_dir):
                                 logging.debug('extracting %s' % tarball_location)
-                                os.makedirs(htmlfiles_dir)
                                 doc_tarball = app.download(tarball_location)
                                 if not doc_tarball:
                                     logging.error('skipped %s as it is missing a doc tarball' % doc_module)
                                     return
+                                os.makedirs(htmlfiles_dir)
                                 tar2 = tarfile.open(doc_tarball, 'r')
                                 ext2_dirname = os.path.join(ext_dirname, 'doc-tarballs', 
self.dirname.split('/')[0])
                                 for tar2info in tar2.getmembers():