shithub: libobj

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don't try to find a material when the list is empty.

--- a/obj.c

+++ b/obj.c

@@ -738,7 +738,7 @@

 					*p++ = c;

 				}while(c = Bgetc(bin), (isalnum(c) || c == '.' || c == '_') && p-buf < sizeof(buf)-1);

 				*p = 0;

-				if((m = getmtl(obj->materials, buf)) == nil){

+				if(obj->materials != nil && (m = getmtl(obj->materials, buf)) == nil){

 					error("no material '%s' found", buf);

 					goto error;

 				}