Allow any share-access value

app/src/main/java/org/tasks/caldav/property/ShareAccess.kt

@@ -34,9 +34,7 @@ data class ShareAccess(val access: Property.Name): Property {
             var eventType = parser.eventType
             while (!(eventType == XmlPullParser.END_TAG && parser.depth == depth)) {
                 if (eventType == XmlPullParser.START_TAG && parser.depth == depth + 1) {
-                    when (val name = parser.propertyName()) {
-                        SHARED_OWNER, READ_WRITE, NOT_SHARED, READ -> result = name
-                    }
+                    result = parser.propertyName()
                 }
                 eventType = parser.next()
             }

app/src/main/java/org/tasks/caldav/property/Sharee.kt

@@ -28,9 +28,10 @@ class Sharee(parser: XmlPullParser) {
                     DavResource.HREF ->
                         XmlUtils.readText(parser)?.let { href = it }
                     ShareAccess.NAME ->
-                        access = PropertyRegistry.create(ShareAccess.NAME, parser) as ShareAccess
+                        PropertyRegistry.create(ShareAccess.NAME, parser)
+                            ?.let { access = it as ShareAccess }
                     COMMENT ->
-                        comment = XmlUtils.readText(parser)
+                        XmlUtils.readText(parser)?.let { comment = it }
                     INVITE_ACCEPTED, INVITE_DECLINED, INVITE_NORESPONSE, INVITE_INVALID ->
                         response = name
                     DavResource.PROP ->