Bump tecnickcom/tcpdf dependency to support php 8 (#12816)

Also fix undefined variable error

composer.json

@@ -56,7 +56,7 @@
         "predis/predis": "^1.1",
         "rmccue/requests": "^1.7",
         "symfony/yaml": "^4.0",
-        "tecnickcom/tcpdf": "~6.2.0",
+        "tecnickcom/tcpdf": "^6.4",
         "tightenco/ziggy": "^0.9",
         "wpb/string-blade-compiler": "^6.0"
     },

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "85d20b0e5d6205452dac25d0d5db067b",
+    "content-hash": "dae39e5a41421453723b043a8a321e35",
     "packages": [
         {
             "name": "amenadiel/jpgraph",
@@ -6469,16 +6469,16 @@
         },
         {
             "name": "tecnickcom/tcpdf",
-            "version": "6.2.26",
+            "version": "6.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/tecnickcom/TCPDF.git",
-                "reference": "367241059ca166e3a76490f4448c284e0a161f15"
+                "reference": "5ba838befdb37ef06a16d9f716f35eb03cb1b329"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/tecnickcom/TCPDF/zipball/367241059ca166e3a76490f4448c284e0a161f15",
-                "reference": "367241059ca166e3a76490f4448c284e0a161f15",
+                "url": "https://api.github.com/repos/tecnickcom/TCPDF/zipball/5ba838befdb37ef06a16d9f716f35eb03cb1b329",
+                "reference": "5ba838befdb37ef06a16d9f716f35eb03cb1b329",
                 "shasum": ""
             },
             "require": {
@@ -6507,7 +6507,7 @@
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "LGPL-3.0"
+                "LGPL-3.0-only"
             ],
             "authors": [
                 {
@@ -6528,9 +6528,16 @@
                 "qrcode"
             ],
             "support": {
-                "source": "https://github.com/tecnickcom/TCPDF/tree/master"
+                "issues": "https://github.com/tecnickcom/TCPDF/issues",
+                "source": "https://github.com/tecnickcom/TCPDF/tree/6.4.1"
             },
-            "time": "2018-10-16T17:24:05+00:00"
+            "funding": [
+                {
+                    "url": "https://www.paypal.com/cgi-bin/webscr?cmd=_donations&currency_code=GBP&business=paypal@tecnick.com&item_name=donation%20for%20tcpdf%20project",
+                    "type": "custom"
+                }
+            ],
+            "time": "2021-03-27T16:00:33+00:00"
         },
         {
             "name": "tightenco/ziggy",

includes/html/reports/alert-log.pdf.inc.php

@@ -3,6 +3,9 @@
 $pdf->AddPage('L');
 $where = '1';
 
+$param = [];
+$data = [];
+
 if (is_numeric($_GET['device_id'])) {
     $where .= ' AND E.device_id = ?';
     $param[] = $_GET['device_id'];