From 4c1d754a1754818b2644a47ab54012ab3b909d6a Mon Sep 17 00:00:00 2001
From: Dan Kelleher <kelleherjdan@gmail.com>
Date: Wed, 15 May 2024 13:46:19 -0400
Subject: [PATCH] check empty arg

---
 ib_async/contract.py | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/ib_async/contract.py b/ib_async/contract.py
index 73ec7d2..fc70999 100644
--- a/ib_async/contract.py
+++ b/ib_async/contract.py
@@ -582,19 +582,15 @@ def liquidSessions(self) -> List[TradingSession]:
         return self._parseSessions(self.liquidHours)
 
     def _parseSessions(self, s: str) -> List[TradingSession]:
-        tz = util.ZoneInfo(self.timeZoneId)
         sessions = []
-        for sess in s.split(";"):
-            if not sess or "CLOSED" in sess:
-                continue
-            sessions.append(
-                TradingSession(
-                    *[
-                        dt.datetime.strptime(t, "%Y%m%d:%H%M").replace(tzinfo=tz)
-                        for t in sess.split("-")
-                    ]
-                )
-            )
+        if s:
+            tz = util.ZoneInfo(self.timeZoneId)
+            for sess in s.split(";"):
+                if not sess or 'CLOSED' in sess:
+                    continue
+                sessions.append(TradingSession(*[
+                    dt.datetime.strptime(t, "%Y%m%d:%H%M").replace(tzinfo=tz)
+                    for t in sess.split("-")]))
         return sessions