do not fail in bulk upload in case of empty input
set isDefault to be readonly and make its default value - false.
Alter table - default.
updated release notes
Merge pull request #1512 from kaltura/IX-9.19.1-delivery_profiles

Ix 9.19.1 delivery profiles
Merge pull request #1511 from kaltura/IX-9.19.0-bulkupload-empty-input

do not fail in bulk upload in case of empty input
Fix cue point list flow
When cue points list request is issued by one of Kaltura's internal
users, skip filtering by partner id
Bump Studio version to 1.6 (aligned with HTML5 lib v2.15)
#PLAT-1650 #time 1d
Refactored DeliveryProfileLiveAppleHttp::checkIsLive()
PLAT-1571 #time 2d
Limiting the number of URLs in is-live tests; Renamed a method.
PLAT-1571
Not limiting the master URLs loop, and testing the *last* 3 .ts URLs
PLAT-1571 #time 6h
Merge pull request #1515 from kaltura/IX-9.19.1-PLAT-1571

Refactored DeliveryProfileLiveAppleHttp::checkIsLive()
strip html tags from setpasshashkey parameter

FEC-1734 #time 3h
changed to work with is_null.
Merge pull request #1514 from kaltura/IX-9.19.1-Delivery-profile-optimizations

Added support for secured HDS
Resetting usage limit warning for doPartnerUsage logics to work properly
PLAT-12 #time 3h
Resetting usage warning in case of free trial extension (but not when it's reset)
PLAT-12
Merge pull request #1517 from kaltura/IX-9.19.1-PLAT-12

Ix 9.19.1 plat 12
Supporting DropFolderFileDeletePolicy::AUTO_DELETE_WHEN_ENTRY_IS_READY
PLAT-1404 #time 5d