#12 Legend shows <= 0 for some queries

[Jacob K Asiedu]

When user selects the ff:
Percent of Population that meets all following criteria: (
AGE: 18-64 years OR 65 years and above ) and (
EDUC: 6, college or professional degree ) and ( SEX:
female ) and ( ERG: Mexican, US Native Born ) and (
POV100: above poverty level )

The legend shows only one rectangle of value <=0 even
though there are values > 0 in the table