bug: import XML text emptiness check trims boolean instead of payload

[somethingwithproof]

Description

The XML import handlers in three files check import_text with:

if (trim(get_nfilter_request_var('import_text') != '')) {

Because of operator precedence, this evaluates the comparison first and passes a boolean to trim(). So the condition is effectively checking get_nfilter_request_var('import_text') != '' and does not trim the actual payload.

Affected locations:

• syslog_alerts.php (around line 942)
• syslog_reports.php (around line 804)
• syslog_removal.php (around line 742)

Impact

Whitespace-only payloads are treated as non-empty and continue into import parsing, producing avoidable parse/validation failures instead of being treated as empty input.

Expected

Trim the payload string first, then compare:

if (trim(get_nfilter_request_var('import_text')) != '') {

This should be applied consistently in all three import handlers.