More usage of dbm::is_result($r) instead of count($r):

- count() returns very different results and never a boolean (not even false on
  error condition).
- therefore you should NOT use it in boolean expressions. This still *can* be
  done in PHP because of its lazyness. But it is discouraged if it comes to
  more clean code.

Signed-off-by: Roland Häder <roland@mxchange.org>

mod/post.php

@@ -23,7 +23,7 @@ function post_post(&$a) {
 				AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1",
 			dbesc($nickname)
 		);
-		if(! count($r))
+		if(! dbm::is_result($r))
 			http_status_exit(500);
 
 		$importer = $r[0];