Revert "Merge pull request #25811 from oss92/to_sentence_fallback_string"

This reverts commit bad3a120f1690f393d8f6204b3ceee60f0ce707b, reversing
changes made to 2384317465ccb1dfca456a2b7798714b99f32711.

Reason: Adding a new option in the API for something that can be done
with a `#presence` check could do.

1 files changed, 1 insertions, 6 deletions

diff --git a/activesupport/test/core_ext/array/conversions_test.rb b/activesupport/test/core_ext/array/conversions_test.rb
index 469efcd934..29e661a99b 100644
--- a/activesupport/test/core_ext/array/conversions_test.rb
+++ b/activesupport/test/core_ext/array/conversions_test.rb
@@ -25,11 +25,6 @@ class ToSentenceTest < ActiveSupport::TestCase
     assert_equal "one, two and three", ["one", "two", "three"].to_sentence(last_word_connector: " and ")
   end
 
-  def test_to_sentence_with_fallback_string
-    assert_equal "none", [].to_sentence(fallback_string: "none")
-    assert_equal "one, two, and three", ["one", "two", "three"].to_sentence(fallback_string: "none")
-  end
-
   def test_two_elements
     assert_equal "one and two", ["one", "two"].to_sentence
     assert_equal "one two", ["one", "two"].to_sentence(two_words_connector: " ")
@@ -63,7 +58,7 @@ class ToSentenceTest < ActiveSupport::TestCase
       ["one", "two"].to_sentence(passing: "invalid option")
     end
 
-    assert_equal exception.message, "Unknown key: :passing. Valid keys are: :words_connector, :two_words_connector, :last_word_connector, :locale, :fallback_string"
+    assert_equal exception.message, "Unknown key: :passing. Valid keys are: :words_connector, :two_words_connector, :last_word_connector, :locale"
   end
 
   def test_always_returns_string