FLNBotRules : protect _filter, _max, _min from empty spaces

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/colonial_twilight/fln_bot_rules.rb b/lib/colonial_twilight/fln_bot_rules.rb
index 8173d10..f82cb39 100644
--- a/lib/colonial_twilight/fln_bot_rules.rb
+++ b/lib/colonial_twilight/fln_bot_rules.rb
@@ -192,15 +192,21 @@ module ColonialTwilight
     # 8.1.2 - Procedure Guidelines
 
     def _filter(spaces, &block)
+      return spaces if spaces.empty?
+
       (f = spaces.select(&block)).empty? ? spaces : f
     end
 
     def _max(spaces, sym)
+      return spaces if spaces.empty?
+
       v = spaces.max { |a, b| a.send(sym) <=> b.send(sym) }.send(sym)
       spaces.select { |s| s.send(sym) == v }
     end
 
     def _min(spaces, sym)
+      return spaces if spaces.empty?
+
       v = spaces.min { |a, b| a.send(sym) <=> b.send(sym) }.send(sym)
       spaces.select { |s| s.send(sym) == v }
     end