added hash compacting to remove nil values from results

Author: jakewmeyer

app.rb

@@ -89,7 +89,7 @@ def hash_merge *hashes
   results = DB.query("SELECT * FROM launch", :cast_booleans => true)
     hash = results.each do |row|
     end
-  JSON.pretty_generate(hash)
+  JSON.pretty_generate(hash.compact)
 end
 
 # Gets upcoming launches