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-rw-r--r--tutorius/constraints.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/tutorius/constraints.py b/tutorius/constraints.py
index 36abdfb..e91f23a 100644
--- a/tutorius/constraints.py
+++ b/tutorius/constraints.py
@@ -200,7 +200,10 @@ class FileConstraint(Constraint):
def validate(self, value):
# TODO : Decide on the architecture for file retrieval on disk
# Relative paths? From where? Support macros?
- #
+ # FIXME This is a hack to make cases where a default file is not valid
+ # work. It allows None values to be validated, though
+ if value is None:
+ return
if not os.path.isfile(value):
raise FileConstraintError("Non-existing file : %s"%value)
return