message: create a new test to demo my problem
diff: @@ -7,7 +7,7 @@ import { Language } from './RowProvider.spec';
  import { ValueListValueConverter } from '../../valueConverters';
  import { WebSqlDataProvider } from '../data-providers/web-sql-data-provider';
  import { SqlDatabase } from '../data-providers/sql-database';
  -import { Done, TestDataApiResponse } from './testHelper.spec';
  +import { Done, testAllDataProviders, TestDataApiResponse } from './testHelper.spec';
  import { DataApi } from '../data-api';
  import { actionInfo } from '../server-action';
  @@ -715,5 +715,13 @@ describe("Test entity relation and count finds", () => {
  done.test();
  expect(fetches).toBe(1);
  });
  -
  + fit("test filtering of null/''", () =>
  + testAllDataProviders(async ({ remult }) => {
  + let repo = remult.repo(h);
  + let a = await repo.create({ id: 'a' }).save();
  + let b = await repo.create({ id: 'b' }).save();
  + let c = await repo.create({ id: 'c', refH: b }).save();
  + expect(await repo.count({ refH: null })).toBe(2);
  + })
  + );
  });
  \ No newline at end of file
  