Merge remote-tracking branch 'origin/QA_4_5' into QA_4_5

ChangeLog

@@ -34,6 +34,7 @@ phpMyAdmin - ChangeLog
 - issue #11758 Missing quoting of table in ALTER CONVERT query
 - issue #11752 PMA 4.5.2 breaks MySQL Master-Master Cluster
 - issue #11757 Export and preview show different SQL for character set
+- issue #11749 Fix possible undefined variables in table operations
 
 4.5.2.0 (2015-11-23)
 - issue #11589 Incorrect parameter in mysqli_fetch_fields()

libraries/tbl_info.inc.php

@@ -106,4 +106,6 @@ if ($showtable) {
         ? 'DEFAULT'
         : $pack_keys;
     unset($create_options, $each_create_option);
-} // end if
+} else {
+    $pack_keys = $row_format = null;
+}// end if