Violation fix for latest rubocop (#2202)

Co-authored-by: Kayla Reopelle <87386821+kaylareopelle@users.noreply.github.com>

Author: thompson-tomo

api/lib/opentelemetry/baggage/propagation/text_map_propagator.rb

@@ -34,7 +34,7 @@ def inject(carrier, context: Context.current, setter: Context::Propagation.text_
           return if baggage.nil? || baggage.empty?
 
           encoded_baggage = encode(baggage)
-          setter.set(carrier, BAGGAGE_KEY, encoded_baggage) unless encoded_baggage&.empty?
+          setter.set(carrier, BAGGAGE_KEY, encoded_baggage) if encoded_baggage && !encoded_baggage.empty?
           nil
         end