Fix 464

CHANGES.rst

@@ -18,7 +18,10 @@ New features:
 
 Bug fixes:
 
-- ...
+- broken properties are not added to the parent component
+  Ref: #471
+  Fixes: #464
+  [jacadzaca]
 
 5.0.1 (2022-10-22)
 ------------------

src/icalendar/cal.py

@@ -383,7 +383,6 @@ def from_ical(cls, st, multiple=False):
                     if not component.ignore_exceptions:
                         raise
                     component.errors.append((uname, str(e)))
-                    component.add(name, None, encode=0)
                 else:
                     vals.params = params
                     component.add(name, vals, encode=0)

src/icalendar/tests/events/issue_464_invalid_rdate.ics

@@ -0,0 +1,7 @@
+BEGIN:VEVENT
+SUMMARY:RDATE period
+DTSTART:19961230T020000Z
+DTEND:19961230T060000Z
+UID:rdate_period
+RDATE;VALUE=PERIOD:19970101T180000Z/19970102T070000Z,199709T180000Z/PT5H30M
+END:VEVENT

src/icalendar/tests/test_issue_104_mark_events_broken.py → src/icalendar/tests/test_components_break_on_bad_ics.py

@@ -18,3 +18,11 @@ def test_dont_ignore_exceptions_on_broken_calendars_issue_104(calendars):
     '''
     with pytest.raises(ValueError):
         calendars.issue_104_broken_calendar
+
+def test_rdate_dosent_become_none_on_invalid_input_issue_464(events):
+    '''Issue #464 - [BUG] RDATE can become None if value is invalid
+    https://github.com/collective/icalendar/issues/464
+    '''
+    assert events.issue_464_invalid_rdate.is_broken
+    assert ('RDATE', 'Expected period format, got: 199709T180000Z/PT5H30M') in events.issue_464_invalid_rdate.errors
+    assert not b'RDATE:None' in events.issue_464_invalid_rdate.to_ical()