[BUGFIX] Avoid PHP warning for request of eID=FalSecuredownloadFileTreeState #216
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Avoid "PHP Warning: Undefined array key "folder" in Classes/Controller/FileTreeStateController.php" (and subsequent creation of sys_log record) when requesting /index.php?eID=FalSecuredownloadFileTreeState without a "folder" parameter by defining a default value.
As the same issue might arise for a call to an existing folder requesting without an "open" parameter define a default here too.
These calls usually are triggered by bots calling all URLs found in the site Javascript.