Fix messaging

Author: fuzzyrichie

lib/ar_query_matchers.rb

@@ -401,8 +401,9 @@ def filter_model_names(subset, show_values, ignore_missing)
 
       def expectation_failed_message(crud_operation, show_values: false, subset: false, ignore_missing: false)
         model_names_with_wrong_count = filter_model_names(subset, show_values, ignore_missing)
-        "Expected ActiveRecord to #{crud_operation} #{expected}, got #{show_values ? @query_stats.query_values : @query_stats.query_counts}\n"\
-          "Expectations that differed:\n#{difference(model_names_with_wrong_count, show_values: show_values).join("\n")}\n\nWhere unexpected queries came from:\n\n#{source_lines(model_names_with_wrong_count).join("\n")}"
+        message = "Expected ActiveRecord to #{crud_operation} #{expected}, got #{show_values ? @query_stats.query_values : @query_stats.query_counts}\n"
+        message += "Expectations that differed:\n#{difference(model_names_with_wrong_count, show_values: show_values).join("\n")}" if show_values
+        message += "\n\nWhere unexpected queries came from:\n\n#{source_lines(model_names_with_wrong_count).join("\n")}"
       end
     end
   end