fix an issue where constraints would bubble an exception when context…

… was nil (#127)

lib/unleash/constraint.rb

@@ -43,6 +43,7 @@ def initialize(context_name, operator, value = [], inverted: false, case_insensi
 
     def matches_context?(context)
       Unleash.logger.debug "Unleash::Constraint matches_context? value: #{self.value} context.get_by_name(#{self.context_name})"
+      return false if context.nil?
 
       match = matches_constraint?(context)
       self.inverted ? !match : match

spec/unleash/constraint_spec.rb

@@ -451,4 +451,9 @@
       end
     end
   end
+
+  it 'does resolves to false rather than crashing when passed a nil context' do
+    constraint = Unleash::Constraint.new('anything', 'NUM_GTE', '6.282')
+    expect(constraint.matches_context?(nil)).to be false
+  end
 end