[Fix #3578] No tags for champs that cannot have user input anyway

app/models/types_de_champ/explication_type_de_champ.rb

@@ -1,2 +1,5 @@
 class TypesDeChamp::ExplicationTypeDeChamp < TypesDeChamp::TextTypeDeChamp
+  def tags_for_template
+    []
+  end
 end

app/models/types_de_champ/header_section_type_de_champ.rb

@@ -1,2 +1,5 @@
 class TypesDeChamp::HeaderSectionTypeDeChamp < TypesDeChamp::TypeDeChampBase
+  def tags_for_template
+    []
+  end
 end