[perl #58438] [PATCH] nci can't pass NULL string arguments

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I was doing a simple test of NCI calls with the xlib function
XDisplayName, and found that nci can't handle a NULL string argument.
Passing a NULL Parrot String segfaults.

The attached patch passes a NULL char * when a NULL Parrot String is
used. Don't know if this is the desired behaviour, I expect comments.

-- 
Salu2

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