Don't error on missing section, just continue

src/config_file.c

@@ -1035,12 +1035,11 @@ static int read_on_variable(
 	GIT_UNUSED(line);
 	GIT_UNUSED(line_len);
 
-	if (!current_section) {
-		giterr_set(GITERR_CONFIG, "no section for key: %s", var_name);
-		return -1;
-	}
+	if (current_section) {
 		git_buf_puts(&buf, current_section);
 		git_buf_putc(&buf, '.');
+	}
+
 	for (c = var_name; *c; c++)
 		git_buf_putc(&buf, git__tolower(*c));