Merge pull request #542 from sheebans/master

Fixed null pointer exception
fixed null pointer issue in assign collection to a class API
Merge pull request #543 from skpcharles/master

fixed null pointer issue in assign collection to a class API
Implemented Changes Party Entity
Merge pull request #544 from saravanab/master

Implemented Changes Party Entity
Merge remote-tracking branch 'gooru/master'
added fix for null pointer expection