Remove empty key value pairs when using advanced search hash

[gdott9]

Description

When a condition in the advanced search hash has an empty value, the condition is not removed so the "LEFT OUTER JOIN" is added to the SQL query without a "WHERE" clause.

Problem

The behavior is not the same when using a simple condition hash (example: {children_name_eq: ''}) versus using an advanced search hash (example: {c: {'0' => {a: ['children_name'], p: 'eq', v: ['']}}}).

The first example results in the following query :

SELECT "people".* FROM "people" ORDER BY "people"."id" DESC

The second example results in the following query :

SELECT "people".* FROM "people" LEFT OUTER JOIN "people" "children_people" ON "children_people"."parent_id" = "people"."id" ORDER BY "people"."id" DESC

Proposed solution

I added code to remove conditions with a blank value in the same way it is done with the simple condition.
Do you see a better way to handle this ?