Use type-specific comparisons over empty

MDErrorReporter.php

@@ -79,7 +79,7 @@ final public function human_filesize(string $bytes, int $decimals = 2):string {
     final private function _formulateDebugMailSection(string $headline, array $toFormat, int $level = 0):string {
 
         $msg = "";
-        if (!empty($headline)) {
+        if ($headline !== "") {
             if ($level === 0) {
                 $msg .= PHP_EOL . "## " . $headline;
                 $msg .= PHP_EOL . "----------------------" . PHP_EOL . PHP_EOL;
@@ -147,7 +147,7 @@ final public function sendDebugMail(string $to, string $subject = "", string $de
 =========================
     ";
 
-        if (!empty($contextInfo)) {
+        if ($contextInfo !== []) {
             $msg .= $this->_formulateDebugMailSection("Context information", $contextInfo);
         }