strListInsert() will now initialize the string list if it's uninitialized (NULL).

strListCombine() will now return an empty string rather than NULL if passed an
uninitialized string list (NULL).

src/xpdev/str_list.c

@@ -118,6 +118,8 @@ static char* str_list_insert(str_list_t* list, char* str, size_t index)
 	size_t	count;
 	str_list_t lp;
 
+	if(*list == NULL)
+		*list = strListInit();
 	count = strListCount(*list);
 	if(index > count)	/* invalid index, do nothing */
 		return(NULL);
@@ -338,9 +340,13 @@ char* DLLCALL strListCombine(str_list_t list, char* buf, size_t maxlen, const ch
 	char*	end;
 	char*	ptr;
 
-	if(list==NULL || maxlen<1)
+	if(maxlen<1)
 		return(NULL);
 
+	memset(buf, 0, maxlen);
+	if(list==NULL)
+		return buf;
+
 	if(buf==NULL)
 		if((buf=(char*)malloc(maxlen))==NULL)
 			return(NULL);