[BUG] Explore table viz returns no result when filter is NULL or NOT NULL

[mmuru]

A clear and concise description of what the bug is.
Explore table viz returns no result when filter is NULL or NOT NULL

Expected results

It should return the result set

Actual results

No data available in table

Screenshots

How to reproduce the bug

1. Go to table
2. Click on 'bart_line' table to explore
3. Scroll down to select Filter -> column 'name' -> is NULL or NOT NULL
4. Run Query
5. See error

Environment

(please complete the following information):

• superset version: Superset 0.999.0dev (check out master)
• python version: 3.6.8
• node.js version: node -v
• npm version: npm -v

Checklist

Make sure these boxes are checked before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

Additional context

SELECT name AS name, count(color) AS "COUNT(color)" FROM bart_lines WHERE false GROUP BY name ORDER BY "COUNT(color)" DESC LIMIT 10000;

The explore request:
http://localhost:8088/superset/explore/?form_data={"datasource":"13__table","viz_type":"table","url_params":{},"time_range_endpoints":["inclusive","exclusive"],"granularity_sqla":null,"time_grain_sqla":"P1D","time_range":"Last+week","groupby":["name"],"metrics":[{"expressionType":"SIMPLE","column":{"id":456,"column_name":"color","verbose_name":null,"description":null,"expression":null,"filterable":true,"groupby":true,"is_dttm":false,"type":"VARCHAR(255)","optionName":"_col_color"},"aggregate":"COUNT","sqlExpression":null,"hasCustomLabel":false,"fromFormData":true,"label":"COUNT(color)","optionName":"metric_qqaak8p1tnh_c7yss63hqv7"}],"percent_metrics":[],"timeseries_limit_metric":null,"row_limit":10000,"include_time":false,"order_desc":true,"all_columns":[],"order_by_cols":[],"adhoc_filters":[{"expressionType":"SIMPLE","subject":"name","operator":"IS+NULL","comparator":"","clause":"WHERE","sqlExpression":null,"isExtra":false,"fromFormData":true,"filterOptionName":"filter_o0vgzbylo8j_78ppchfrsx3"}],"table_timestamp_format":"%Y-%m-%d+%H:%M:%S","page_length":0,"include_search":false,"table_filter":false,"align_pn":false,"color_pn":true,"show_cell_bars":true}

[etr2460]

I believe this was resolved with #9613