Merge "Fix more to support undefined behaviour"

diff --git a/polygerrit-ui/app/behaviors/gr-change-table-behavior/gr-change-table-behavior.html b/polygerrit-ui/app/behaviors/gr-change-table-behavior/gr-change-table-behavior.html
index d3cd940..d03316a 100644
--- a/polygerrit-ui/app/behaviors/gr-change-table-behavior/gr-change-table-behavior.html
+++ b/polygerrit-ui/app/behaviors/gr-change-table-behavior/gr-change-table-behavior.html

@@ -55,6 +55,9 @@
      * @return {boolean}
      */
     isColumnHidden(columnToCheck, columnsToDisplay) {
+      if ([columnsToDisplay, columnToCheck].some(arg => arg === undefined)) {
+        return false;
+      }
       return !columnsToDisplay.includes(columnToCheck);
     },
 

diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js
index 2d6b440..8fd4214 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js

@@ -187,8 +187,13 @@
       if (account) {
         this.showNumber = !!(preferences &&
             preferences.legacycid_in_change_table);
-        this.visibleChangeTableColumns = preferences.change_table.length > 0 ?
-          this.getVisibleColumns(preferences.change_table) : this.columnNames;
+        if (preferences.change_table &&
+            preferences.change_table.length > 0) {
+          this.visibleChangeTableColumns =
+            this.getVisibleColumns(preferences.change_table);
+        } else {
+          this.visibleChangeTableColumns = this.columnNames;
+        }
       } else {
         // Not logged in.
         this.showNumber = false;

diff --git a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js
index d5eeee8..53c5ef5 100644
--- a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js
+++ b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js

@@ -305,7 +305,8 @@
       if (!account) { return; }
 
       this.$.restAPI.getPreferences().then(prefs => {
-        this._userLinks = prefs.my.map(this._fixCustomMenuItem);
+        this._userLinks = prefs && prefs.my ?
+          prefs.my.map(this._fixCustomMenuItem) : [];
       });
     }