Add trim() for string comparison

html/typo3conf/ext/ter/class.tx_ter_api.php

@@ -169,7 +169,7 @@ class tx_ter_api
             );
         }
 
-        if ((string)$extensionInfoData->infoData->uploadComment === '') {
+        if (trim((string)$extensionInfoData->infoData->uploadComment) === '') {
             throw new \T3o\Ter\Exception\NoUploadCommentException(
                 'You need to set an upload comment!',
                 TX_TER_ERROR_UPLOADEXTENSION_NOUPLOADCOMMENT