[CLEANUP] CI-related fixes

extensions/karma/Classes/Service/KarmaService.php

@@ -215,11 +215,11 @@ class KarmaService implements \TYPO3\CMS\Core\SingletonInterface
      */
     public function triggerKarmaIssuerActionForUser($issuerCode, $issuerActionCode, ExtbaseFrontendUser $frontendUser)
     {
-        if (!key_exists($issuerCode, $this->settings['issuers'])) {
+        if (!array_key_exists($issuerCode, $this->settings['issuers'])) {
             throw new \Exception('Issuer code "' . $issuerCode . '" does not exist.', 1549968187);
         }
 
-        if (!key_exists($issuerActionCode, $this->settings['issuers'][$issuerCode])) {
+        if (!array_key_exists($issuerActionCode, $this->settings['issuers'][$issuerCode])) {
             throw new \Exception('Issuer action code "' . $issuerActionCode . '" does not exist.', 1549968249);
         }
 
@@ -230,7 +230,7 @@ class KarmaService implements \TYPO3\CMS\Core\SingletonInterface
             throw new \Exception('Empty karma source code supplied. Please configure it in TypoScript.', 1541508560);
         }
 
-        if (!key_exists($karmaSourceCode, $this->settings['sourceCodes'])) {
+        if (!array_key_exists($karmaSourceCode, $this->settings['sourceCodes'])) {
             throw new \Exception('Karma source code "' . $karmaSourceCode . '" does not exist.', 1549968362);
         }