test-subprocess: fix segfault without arguments
Check if we even have a parameter before checking its value. Running this command without any arguments may not make a lot of sense, but reacting with a segmentation fault is unduly harsh. While we're at it, avoid casting argv by declaring it const right away. Signed-off-by: NRene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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