Land rapid7#4650, #strip NilClass fix

Author: wvu

modules/post/multi/gather/rubygems_api_key.rb

@@ -48,7 +48,7 @@ def run
   def extract_key(path)
     data = read_file(path)
     keys = data.split(':').select { |k| k =~ /[0-9a-f]{32}/ }
-    keys.first.strip
+    keys.map { |k| k.strip }.first
   end
 
   def download_key(paths)