Ensuring extensionDate is a string
PLAT-1198 #time 10m
Merge branch 'IX-9.14.0-PLAT-1198' into IX-9.15.0-PLAT-1198
Merge pull request #1077 from kaltura/IX-9.15.0-PLAT-1198

IX-9.15.0-PLAT-1198 : Ensuring extensionDate is a string