L4T 35.4.1 tegraparser_v2 returns error on zero length DATAFILE

[Lexmark-chad]

TL;DR;

There appears to be an error, but everything seems to work OK.

See this forum post for context.

An error will be shown in digsigserver's logs although the generation of flash.idx is the last step in the signing functions within tegraflash_internal.py. No error codes are captured and returned so digsigserver is going to return success - 200. The resulting packaging will be missing flash.idx, but I'm not sure what it is used for. As I was chasing issues with getting signing completely working with L4T 35.4.1 tooling I thought this was the source of one of my issues so I crafted a 'fix' in this branch to the tegraXXX-flash-helper scripts. Turns out that doesn't really fix anything other than addressing the superficial error in the logs.

Worth fixing? Ignore? I think it's worth fixing so that this error doesn't lead to future chasing of red herrings.

[madisongh]

What we probably need to do is update the helper scripts to remove those touch commands and instead remove the DATAFILE and other problematic file references in a temp copy of the layout. Something along those lines, at least.