Fix guard clauses

Author: robertomiranda

lib/promenade/pitchfork/stats.rb

@@ -27,8 +27,8 @@ def initialize
 
         raindrops_stats = Raindrops::Stats.new
 
-        @active_workers = raindrops_stats.active_workers
-        @queued_requests = raindrops_stats.queued_requests
+        @active_workers = raindrops_stats.active_workers || 0
+        @queued_requests = raindrops_stats.queued_requests || 0
       end
 
       def instrument
@@ -47,16 +47,13 @@ def self.instrument
         attr_reader :workers_count, :live_workers_count, :active_workers, :queued_requests
 
         def capacity
-          return 0 if live_workers_count.nil? || active_workers.nil?
-          return 0 if live_workers_count&.zero?
-          return 0 if active_workers&.zero?
+          return 0 if live_workers_count.nil? || live_workers_count.zero?
 
           live_workers_count - active_workers
         end
 
         def busy_percent
-          return 100 if live_workers_count.zero?
-          return 100 if active_workers&.zero?
+          return 0 if live_workers_count.zero?
 
           (active_workers.to_f / live_workers_count) * 100
         end