Use tag.attributes to set conditional HTML attributes

Using an `if..else` block made the code harder to follow since the
opening tag was inside the block but the closing tag was outside it.
Moreover, it didn't work well with HTML Beautifier (a gem we're going to
introduce to manage ERB indentations).

app/components/budgets/budget_component.html.erb

@@ -1,9 +1,4 @@
-<% if budget.image.present? %>
+<div <%= tag.attributes(html_attributes) %>>
-  <div class="budget-header with-background-image"
-       style="<%= attached_background_css polymorphic_path(budget.image.variant(:large)) %>">
-<% else %>
-  <div class="budget-header">
-<% end %>
   <div class="row">
     <div class="small-12 column text-center">
       <span class="budget-title"><%= t("budgets.index.title") %></span>

app/components/budgets/budget_component.rb

@@ -5,4 +5,17 @@ class Budgets::BudgetComponent < ApplicationComponent
   def initialize(budget)
     @budget = budget
   end
+
+  private
+
+    def html_attributes
+      if budget.image.present?
+        {
+          class: "budget-header with-background-image",
+          style: attached_background_css(polymorphic_path(budget.image.variant(:large)))
+        }
+      else
+        { class: "budget-header" }
+      end
+    end
 end

app/views/legislation/draft_versions/show.html.erb

@@ -58,14 +58,14 @@
           <div><span class="panel-title"><%= t("legislation.draft_versions.show.text_body") %></span></div>
         </div>
         <div id="sticky-panel" class="draft-text">
-          <% if @draft_version.final_version? %>
+          <section <%= tag.attributes(
-          <section>
+                         class: "legislation-annotatable",
-          <% else %>
+                         data: {
-          <section class="legislation-annotatable"
+                           "legislation-draft-version-id": @draft_version.id,
-                   data-legislation-draft-version-id="<%= @draft_version.id %>"
+                           "legislation-annotatable-base-url": legislation_process_draft_version_path(@process, @draft_version),
-                   data-legislation-annotatable-base-url="<%= legislation_process_draft_version_path(@process, @draft_version) %>"
+                           "legislation-open-phase": @process.allegations_phase.open?
-                   data-legislation-open-phase="<%= @process.allegations_phase.open? %>">
+                         }
-          <% end %>
+                       ) unless @draft_version.final_version? %>>
             <%= AdminLegislationSanitizer.new.sanitize(@draft_version.body_html) %>
           </section>
         </div>