fix: binary operator computes false by default

app/models/logic/binary_operator.rb

@@ -33,7 +33,7 @@ class Logic::BinaryOperator < Logic::Term
     l = @left.compute(champs)
     r = @right.compute(champs)
 
-    l.send(operation, r)
+    l&.send(operation, r) || false
   end
 
   def to_s = "(#{@left} #{operation} #{@right})"

spec/models/logic/binary_operator_spec.rb

@@ -22,9 +22,12 @@ end
 
 describe Logic::GreaterThan do
   include Logic
+  let(:champ) { create(:champ_integer_number, value: nil) }
+
   it 'computes' do
     expect(greater_than(constant(1), constant(1)).compute).to be(false)
     expect(greater_than(constant(2), constant(1)).compute).to be(true)
+    expect(greater_than(champ_value(champ.stable_id), constant(2)).compute([champ])).to be(false)
   end
 end