Fix Version field interpreting ints as BigDecimal

In some cases the "version" var would be a BigDecimal. This led to
1) versions being displayed as "1.0.2.0" instead of "1.2", and 2) versions with letters (e.g A.0) leading to a 500 error, as BigDecimal#chr doesn't exist

app/helpers/dmsf_upload_helper.rb

@@ -207,6 +207,7 @@ module DmsfUploadHelper
 
   # 1 -> 1, -65 -> A
   def self.gui_version(version)
+    version = version.to_i # catch the case where version is a BigDecimal
     return version if version >= 0
     (-version).chr
   end