0034291: In "Price List Schema" window, cannot pick a product without "Product Category" field selected

Description

In "Price List Schema" window, if we create a new line, we cannot pick a product without "Product Category" field selected.

Steps To Reproduce

1) Open "Price List Schema" window and select a price list schema of the list.
2) Create a new line, leave "Product Category" field empty and select a product using the selector.
-- It shows message "No items to show"

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Relationships [ Relation Graph ] [ Dependency Graph ]

Notes
(0090877) caristu (viewer) 2016-10-25 17:39	When the SelectorDatasourceFilter tries to resolve the filter expression makes use of the ParameterUtils.getJSExpressionResult(). At this point the parameters with a null value, has the string 'null' as value. This causes that the engine interprets the following expression as true: if (OB.getParameters().get('inpmProductCategoryId')) which eventually results on the following where expression: e.product.productCategory.id = 'null'

Issue History
Date Modified	Username	Field	Change
2016-10-25 16:57	JONHM	New Issue
2016-10-25 16:57	JONHM	Assigned To	=> platform
2016-10-25 16:57	JONHM	OBNetwork customer	=> Yes
2016-10-25 16:57	JONHM	Modules	=> Core
2016-10-25 16:57	JONHM	Support ticket	=> 44056
2016-10-25 16:57	JONHM	Triggers an Emergency Pack	=> No
2016-10-25 17:39	caristu	Note Added: 0090877
2016-12-01 13:11	alostale	Status	new => acknowledged
2016-12-01 13:20	alostale	Priority	high => normal
2022-02-01 08:05	alostale	Assigned To	platform => Triage Platform Base