fix crash when populating timstamp

app/activities/TransactionEditor.py

@@ -5,6 +5,8 @@
 #
 # THIS SOFTWARE IS PROVIDED AS IS WITHOUT WARRANTY
 import itertools
+from dateutil.parser import parse as parse_time
+from dateutil.parser._parser import ParserError
 from decimal import Decimal, InvalidOperation
 from itertools import chain
 from typing import Callable, Union
@@ -108,6 +110,10 @@ class TransactionEditor(FocusWidget):
     def update(self):
         data = self.data
         date, store = data['ts'], data['store']
+        try:
+            parse_time(date)
+        except ParserError:
+            date = None
         self.text_fields['dbview'].set_text(
             self.query_manager.get_session_transactions(date, store) if None not in (
                 date or None, store or None
@@ -186,7 +192,7 @@ class TransactionEditor(FocusWidget):
         if len(options):
             widget._emit('open', options)
             return
-        
+
         new_product_activity = self.activity_manager.get('new_product')
         current_activity = self.activity_manager.current()
         if current_activity is not new_product_activity and name in (
@@ -194,7 +200,7 @@ class TransactionEditor(FocusWidget):
         ):
             self.new_product_callback(name)
         return
-    
+
     def new_product_callback(self, name):
         cur = self.activity_manager.current()
         txn = self.activity_manager.get('transaction')