Fix: Allow non-block TimeTravel.freeze and remove redundant test

Author: bolshakov

spec/support/time_travel.rb

@@ -16,13 +16,11 @@ def freeze(time = Time.now)
               redis.rpop(STACK_KEY)
             end
           end
-        elsif redis.exists?(STACK_KEY)
+        else
           redis.del(STACK_KEY)
           Timecop.freeze(time)
           redis_time_ms = (Time.now.to_f * 1000).to_i
           redis.rpush(STACK_KEY, redis_time_ms)
-        else
-          raise LocalJumpError, "freeze requires a block"
         end
       end
 

spec/unit/stoplight/infrastructure/redis/storage/time_travel_spec.rb

@@ -14,14 +14,6 @@
       end
     end
 
-    it "requires a block" do
-      frozen_time = Time.new(2025, 6, 15, 14, 30, 45)
-
-      expect do
-        Stoplight::TimeTravel.freeze(frozen_time)
-      end.to raise_error(LocalJumpError, /requires a block/)
-    end
-
     it "preserves outer context after nested freeze block" do
       start_time = Time.new(2025, 1, 1, 12, 0, 0)
       inner_time = Time.new(2025, 6, 15, 14, 30, 45)