Handle empty values in `get_query_results_as_dict` macro#1011

dbeatty10 wants to merge 2 commits intomaindbt-labs/dbt-utils:mainfrom

dbeatty/issue-1009-get_query_results_as_dictdbt-labs/dbt-utils:dbeatty/issue-1009-get_query_results_as_dictCopy head branch name to clipboard