Made the recurrence rule parser tolerant of trailing semicolons.

CHANGES.rst

@@ -8,6 +8,9 @@ Changelog
 - Documentation fixes.
   [t-8ch, thet]
 
+- Made RRULE tolerant of trailing semicolons.
+  [sleeper]
+
 
 3.8.4 (2014-11-01)
 ------------------

src/icalendar/prop.py

@@ -666,7 +666,10 @@ class vRecur(CaselessDict):
         try:
             recur = cls()
             for pairs in ical.split(';'):
-                key, vals = pairs.split('=')
+                try:
+                    key, vals = pairs.split('=')
+                except ValueError:
+                    continue
                 recur[key] = cls.parse_type(key, vals)
             return dict(recur)
         except: