MDL-62815 mod_lti: fix javascript error + bump version number

mod/lti/mod_form.js

@@ -149,6 +149,10 @@
         },
 
         updateAutomaticToolMatch: function(field){
+            if (!field) {
+                return;
+            }
+
             var self = this;
 
             var toolurl = field;

mod/lti/version.php

@@ -48,7 +48,7 @@
 
 defined('MOODLE_INTERNAL') || die;
 
-$plugin->version   = 2019111800;    // The current module version (Date: YYYYMMDDXX).
+$plugin->version   = 2020010800;    // The current module version (Date: YYYYMMDDXX).
 $plugin->requires  = 2019111200;    // Requires this Moodle version.
 $plugin->component = 'mod_lti';     // Full name of the plugin (used for diagnostics).
 $plugin->cron      = 0;