TableBuilderHelper: Fix NoMethodError when `current_referential` undef

Certain controllers (`Calendar` and `Referential`) don't define a
`#current_referential` method. In those cases, we'd get a
`NoMethodError` in this function when calling `#current_referential`.

To avoid the error, give `current_referential` a default value. Using a
default of `nil` works here because the current referential is needed in
other places in order to build links. Since the links in the special
models don't need a referential in order to be built, we don't care that
the value is `nil`.

Refs #3479

1 files changed, 4 insertions, 0 deletions

diff --git a/app/helpers/table_builder_helper.rb b/app/helpers/table_builder_helper.rb
index d748ec33a..1ddd629f8 100644
--- a/app/helpers/table_builder_helper.rb
+++ b/app/helpers/table_builder_helper.rb
@@ -104,6 +104,10 @@ module TableBuilderHelper
   end
 
   def tbody(collection, columns, selectable, links)
+    # Certain controllers don't define a `#current_referential`. If the method
+    # is unavailable, give it a default value to avoid a `NoMethodError`.
+    current_referential ||= nil
+
     content_tag :tbody do
       collection.map do |item|