fix: check if asset id exists before creating a hotspot image

[zoidbergx]

Changes in this pull request

check asset id before creating a hotspot image object when getting data from edit mode

Additional info

If a hotpsot image is saved without an asset the function getDataFromEditMode returns a new object even no id from asset is set. This could bypass a validation check as a new object is created.

I added the same check as in the Image class

HOW

• create a fieldcollection with an advanced image type and set the image as mandatory
• add the fieldcollection to any object
• create a new object
• add a fieldcollection entry but without adding an asset reference
• save and publish the object
• the mandatory check is bypassed as the current code returns a new object even without an asset assigned