Linter: Fix actionview-no-silent-helper inside blocks

[markokajzer]

found some false positives I think

EDIT: closes #1629, closes #1635, closes #1636

conditionals

<% if admin? %>
  <%= link_to "Admin", admin_path %>
<% end %>

loops

<% ["Herb", "Home"].each do %>
  <%= link_to it, home_path %>
<% end %>

[markokajzer]

I just saw that sb mentioned that

This seems to be a regression in 0.9.6, as the same file produces no offenses on 0.9.5.

So this might not be the fix that we want.

However, I noticed that similar rules use visitERB**Content**Node, not visitERBNode, so I was guessing we might need the same here.