Fixes bad range value error

Author: picandocodigo

elasticsearch-xpack/spec/support/test_file/test.rb

@@ -173,8 +173,7 @@ def skip_version?(client, skip_definition)
           return true if skip_definition['version'] == 'all'
           range_partition =  /\s*-\s*/
           if versions = skip_definition['version'] && skip_definition['version'].partition(range_partition)
-            low = versions[0]
-            high = versions[2] unless versions[2] == ''
+            low, high = __parse_versions(versions)
             range = low..high
             begin
               server_version = client.info['version']['number']
@@ -192,6 +191,12 @@ def is_a_validation?(action)
         def expects_exception?(action)
           action['do'] && action['do']['catch']
         end
+
+        def __parse_versions(versions)
+          low = versions[0]
+          high = (['', nil, '-'].include? versions[2]) ? low : versions[2]
+          [low, high]
+        end
       end
     end
   end