Changed check_min_api_version() to print error messages and throw an error if the minimum api is not satisfied. Updated the scripts to reflect the changed check_min_api_version().

official/copy_paste_metadata.lua

@@ -28,10 +28,7 @@ USAGE
 local dt = require "darktable"
 local du = require "lib/dtutils"
 
-if not du.check_min_api_version("3.0.0") then
-  dt.print("ERROR:copy_paste_metadata not loaded.  Lua API version 3.0.0 or greater required.")
-  return
-end
+du.check_min_api_version("3.0.0", "copy_paste_metadata")
 
 -- set this to "false" if you don't want to overwrite metadata fields
 -- (title, description, creator, publisher and rights) that are already set