Don't silently ignore the last line of configuration file that
consists solely of one unterminated token (inspired by #150).

src/core/ngx_conf_file.c

diff --git a/src/core/ngx_conf_file.c b/src/core/ngx_conf_file.c
index bb39f42..892fa47 100644
--- a/src/core/ngx_conf_file.c
+++ b/src/core/ngx_conf_file.c
@@ -465,7 +465,7 @@
 
             if (cf->conf_file->file.offset >= file_size) {
 
-                if (cf->args->nelts > 0) {
+                if (cf->args->nelts > 0 || !last_space) {
 
                     if (cf->conf_file->file.fd == NGX_INVALID_FILE) {
                         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,