Equals does not work correctly on entities with nullable properties

[IvanGeorgiev89]

Currently equals does not work correctly on entities with nullable properties.

This is a side-effect of inconsistency when populating the values map in EntityImplementation:

1. Loading the entity does not populate null values ( does not create property: value entry ) in EntityImplementation.values
2. Initializing a new entity via the Entity factory companion does populate null values ( creates property: value entry ) in EntityImplementation.values
3. EntityImplementation delegates equals() to the LinkedHashMap holding the values.

Therefore for an entity declared as E(A, B, C?):
if we do :

• e1 = E { a1, b1, null }
• database.sequenceOf(E).add(e1)

Then we get

• e1 != database.sequenceOf(E).find { it.a eq a1 }