[Bug/Regression] --quote sometimes produces a trailing empty argument

[Achim Gratz]

I've updated parallel from 20180222 to 20181122 last week at work and
today I ran into a prblem that I could trace to an invocation of sem
with --quote that would add a trailing empty argument to the command.
The command in this particular case tried to interpret the extra
argument as an additional filename to process and dutifully failed.  I'm
using --quote quite extensively and it hasn't failed for other
invocations, but in these cases the input to parallel or sem is provided
by an inline (:::) input.


Regards,
Achim.
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