R_OpenSiteFile: Do not use a null ptr as filename in fopen (PR#312)

[Peter Dalgaard BSA]

guido@hal.stat.unipd.it writes:

> The same happens also under Windows where, for this reason, 
> 'R_fopen' is defined as
>  
> FILE *R_fopen(const char *filename, const char *mode)
> {
>     if (!filename)
> 	return NULL;
>     return (fopen(filename, mode));
> }

..which I was just in the process of implementing for the Unix
version.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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