Drupal 8.x

I have an module that creates a custom field type with validation. Everything works as expected when possible values for the field is limited to 1 in a content type, and when creating a node for the first time even with multiple values.

However if I want to edit the content Drupal will create a blank instance to add another field automatically. When I ignore it by leaving it blank my validation reacts and stop me from saving complaining on the blank fields. Is there a way to inform the validator to ignore a new blank field value?

After getting the same set of errors from multiple attempts. I even R.t.F.M. after several failed attempts.
Tried everything I could think of to trouble shoot the problem, short of diving into the code. My reasoning for not doing that was, "Approach this as someone with limited experience and/or resources."

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Someone knows why am I receiving status 500 on this:

POST on http://realestate8/entity/file

Headers
Authorization: Basic YWRtaW46YWRtaW4=
Content-Type: application/hal+json

I have found a lot of examples on the web of there being a BLOCK CACHING control in the block manage form. But I am running RC3 and I don't see it.

I have enabled and disabled all caching controls I can possibly find, including inside the view that produces the block I am trying to not cache, but I still get cached results in the view output.

Did Block caching change recently, or is there somewhere else in the admin I can force a view's block to not cache?

Hi,
I installed Drupal 8 and Enabled maintenance mode "Put site into maintenance mode".

But when i checked with an anonymous user, Do not show maintenance massage, Just displayed user login form in home page.

Is that correct?

Please help