Ensure we are returning either `true` or `false` for `#==`

460eb83d cused `ActiveRecord::Base#==` to sometimes return `nil` in some cases,
this ensures we always return a boolean value. Also fixed a similar problem in
AR reflections.

activerecord/lib/active_record/core.rb

@@ -299,7 +299,7 @@ def encode_with(coder)
     def ==(comparison_object)
       super ||
         comparison_object.instance_of?(self.class) &&
-        id &&
+        !id.nil? &&
         comparison_object.id == id
     end
     alias :eql? :==

activerecord/lib/active_record/reflection.rb

@@ -151,7 +151,7 @@ def ==(other_aggregation)
         super ||
           other_aggregation.kind_of?(self.class) &&
           name == other_aggregation.name &&
-          other_aggregation.options &&
+          !other_aggregation.options.nil? &&
           active_record == other_aggregation.active_record
       end
 

activerecord/test/cases/base_test.rb

@@ -533,6 +533,7 @@ def test_find_by_slug
 
   def test_equality_of_new_records
     assert_not_equal Topic.new, Topic.new
+    assert_equal false, Topic.new == Topic.new
   end
 
   def test_equality_of_destroyed_records
@@ -544,6 +545,12 @@ def test_equality_of_destroyed_records
     assert_equal topic_2, topic_1
   end
 
+  def test_equality_with_blank_ids
+    one = Subscriber.new(:id => '')
+    two = Subscriber.new(:id => '')
+    assert_equal one, two
+  end
+
   def test_hashing
     assert_equal [ Topic.find(1) ], [ Topic.find(2).topic ] & [ Topic.find(1) ]
   end
@@ -578,12 +585,6 @@ def test_destroy_without_prepared_statement
     assert_equal nil, Topic.find_by_id(topic.id)
   end
 
-  def test_blank_ids
-    one = Subscriber.new(:id => '')
-    two = Subscriber.new(:id => '')
-    assert_equal one, two
-  end
-
   def test_comparison_with_different_objects
     topic = Topic.create
     category = Category.create(:name => "comparison")