Don't ignore when we can't parse a file

We are quite inconsistent when it comes to reporting back errors.
One case where this caused somewhat unexpected behavior was when the
user would try to open a .csv file by passing it as command line
argument. The file was silently ignored, but treated as if it had been
opened successfully.

Now we issue a somewhat reasonable error message.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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