[jhbuild] do not crash if there is no "triggers" directory

[Craig Keogh <cskeogh src gnome org>]

commit f1ac37e0063eae9d5e221a6fdc3be6ee930d26f9
Author: Marcin Wojdyr <wojdyr gmail com>
Date:   Sun May 6 16:27:33 2012 +0100

    do not crash if there is no "triggers" directory
    
    (can be useful for projects that do not need triggers)

 jhbuild/utils/trigger.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/jhbuild/utils/trigger.py b/jhbuild/utils/trigger.py
index 3aa91f1..dbc74eb 100644
--- a/jhbuild/utils/trigger.py
+++ b/jhbuild/utils/trigger.py
@@ -77,6 +77,8 @@ should be run."""
         return ['/bin/sh', self._file]
 
 def load_all(dirpath):
+    if not os.path.isdir(dirpath):
+        return []
     result = []
     for filename in os.listdir(dirpath):
         if not filename.endswith(Trigger.SUFFIX):