[BUGFIX] Do not suppress parse errors in ext_emconf.php files

In case of parse errors in an ext_emconf.php file, the error message
has been suppressed because of an @include(). Nevertheless, the EM
stops working with a blank page (without any error log entry).

Removing the @ shows the warning so that it easier for the user to
identify the erroneous extension.

Change-Id: I971da980ace41d91dc99f466f1eb137bb0a46add
Resolves: #17506
Releases: 4.5, 4.6
Reviewed-on: http://review.typo3.org/2503
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
Reviewed-by: Steffen Kamper
Tested-by: Steffen Kamper
Reviewed-by: Steffen Gebert
Tested-by: Steffen Gebert

typo3/sysext/em/classes/tools/class.tx_em_tools.php

@@ -313,7 +313,7 @@ final class tx_em_Tools {
 	 */
 	public static function includeEMCONF($path, $_EXTKEY) {
 		$EM_CONF = NULL;
-		@include($path);
+		include($path);
 		if (is_array($EM_CONF[$_EXTKEY])) {
 			return self::fixEMCONF($EM_CONF[$_EXTKEY]);
 		}