From ce3a6bba0f47cf5185ec21ede53e7ae19dd4c85f Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Fri, 10 Jun 2022 19:03:13 +1000
Subject: [PATCH] Fix bug where MS Project files with optional weekdays failed
 to import

---
 src/ifc4d/ifc4d/msp2ifc.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ifc4d/ifc4d/msp2ifc.py b/src/ifc4d/ifc4d/msp2ifc.py
index 8a4a7d4587..470bcc435b 100644
--- a/src/ifc4d/ifc4d/msp2ifc.py
+++ b/src/ifc4d/ifc4d/msp2ifc.py
@@ -110,7 +110,9 @@ class MSP2Ifc:
         for calendar in project.find("pr:Calendars", self.ns).findall("pr:Calendar", self.ns):
             calendar_id = calendar.find("pr:UID", self.ns).text
             week_days = []
-            for week_day in calendar.find("pr:WeekDays", self.ns).findall("pr:WeekDay", self.ns):
+            week_days_element = calendar.find("pr:WeekDays", self.ns)
+            week_day_elements = week_days_element.findall("pr:WeekDay", self.ns) if week_days_element else []
+            for week_day in week_day_elements:
                 working_times = []
                 if week_day.find("pr:WorkingTimes", self.ns):
                     for working_time in week_day.find("pr:WorkingTimes", self.ns).findall("pr:WorkingTime", self.ns):