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-rw-r--r--resources/libraries/python/OptionString.py5
1 files changed, 3 insertions, 2 deletions
diff --git a/resources/libraries/python/OptionString.py b/resources/libraries/python/OptionString.py
index d6cb40f714..7c8b2d066a 100644
--- a/resources/libraries/python/OptionString.py
+++ b/resources/libraries/python/OptionString.py
@@ -93,8 +93,9 @@ class OptionString(object):
return self
def _check_and_add(self, part, prefixed):
- """Convert to string, strip, add conditionally prefixed if non-empty.
+ """Convert to string, strip, conditionally add prefixed if non-empty.
+ Value of None is converted to empty string.
Emptiness is tested before adding prefix.
:param part: Unchecked part to add to list of parts.
@@ -104,7 +105,7 @@ class OptionString(object):
:returns: The converted part without prefix, empty means not added.
:rtype: str
"""
- part = str(part).strip()
+ part = "" if part is None else str(part).strip()
if part:
prefixed_part = self.prefix + part if prefixed else part
self.parts.append(prefixed_part)