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-rw-r--r--tutorius/constraints.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/tutorius/constraints.py b/tutorius/constraints.py
index 36abdfb..2bc27aa 100644
--- a/tutorius/constraints.py
+++ b/tutorius/constraints.py
@@ -201,6 +201,8 @@ class FileConstraint(Constraint):
# TODO : Decide on the architecture for file retrieval on disk
# Relative paths? From where? Support macros?
#
+ if value is None:
+ return
if not os.path.isfile(value):
raise FileConstraintError("Non-existing file : %s"%value)
return