Allow user profiles to be empty

When a user profile is effectively empty (when rendered, it does not
contain any actual visible text), also display the quiet enigma text.

app/views/users/edit_profile.html.erb

@@ -37,7 +37,8 @@
     <%= f.text_field :username, class: 'form-element', autocomplete: 'off' %>
   </div>
 
-  <%= render 'shared/body_field', f: f, field_name: :profile_markdown, field_label: 'Profile', post: current_user %>
+  <%= render 'shared/body_field', f: f, field_name: :profile_markdown, field_label: 'Profile', post: current_user,
+             min_length: 0 %>
 
   <div class="post-preview"></div>
 

app/views/users/show.html.erb

@@ -44,10 +44,11 @@
         <% end %>
       </p>
 
-      <% if @user.profile.nil? || @user.profile.blank? %>
+      <% effective_profile = raw(sanitize(@user.profile&.strip || '', scrubber: scrubber)) %>
+      <% if effective_profile.blank? %>
         <p class="is-lead">A quiet enigma. We don't know anything about <span dir="ltr"><%= rtl_safe_username(@user) %></span> yet.</p>
       <% else %>
-        <%= raw(sanitize(@user.profile, scrubber: scrubber)) %>
+        <%= effective_profile %>
       <% end %>
       </div>