[CI] Test Runner: Fix compare strings for empty in test runner

Author: picandocodigo

api-spec-testing/rspec_matchers.rb

@@ -238,7 +238,7 @@ def compare_string(expected, actual_value, test, response)
       # different from what Ruby uses, so we transform  X.XXXXEXX to X.XXXXXe+XX
       # to be able to compare the values
       actual_value.to_s == expected.gsub('E', 'e+')
-    elsif expected == ''
+    elsif expected == '' && actual_value != ''
       actual_value == response
     else
       expected == actual_value

elasticsearch-xpack/spec/xpack/rest_api_yaml_spec.rb

@@ -30,7 +30,8 @@
       next
     end
 
-    context "#{file.gsub("#{YAML_FILES_DIRECTORY}/", '')}" do
+    ctx = file.gsub("#{YAML_FILES_DIRECTORY}/", '')
+    context ctx do
       before(:all) do
         # Runs once before all tests in a test file
         Elasticsearch::RestAPIYAMLTests::TestFile.wipe_cluster(ADMIN_CLIENT)