create default program name if one doesn't exist
create default program name if one doesn't exist

[#158484929] when we load a program from dataset metadata, it doesn't have a file name/location on the server.  This is because we are working from a copy of a program, not an actual program saved on the server.  Give it date/time file name when we load it in case the user plans to save it.

manylabs/flow-server,manylabs/flow-server,manylabs/flow-server