invalid filter expressions are treated as 'False' instead of causing an error
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Making filter block compliant with new enum model
BLK-33 Updates dynamic fields block to use expression property

Signed-off-by: Oren Leiman <oren@neutral.io>
BLK-33 Updates Filter block and tests to use ExpressionProperty

Signed-off-by: Oren Leiman <oren@neutral.io>