docs(changelog): add 1.7.5 release notes

Previously, when an `ngClass` expression evaluated to something that was
not a string, array or object (and was truthy), an error would be thrown
while trying to call `.split()` on a non-string value. This error was
not very helpful for the user to identify the root cause of the problem.

This commit fixes it by ensuring such values are converted to string.

Fixes #16697

Closes #16699

CHANGELOG.md

@@ -1,3 +1,13 @@
+<a name="1.7.5"></a>
+# 1.7.5 anti-prettification (2018-10-04)
+
+## Bug Fixes
+- **ngClass:** do not break on invalid values
+  ([f3a565](https://github.com/angular/angular.js/commit/f3a565872d802c94bb213944791b11b483d52f73),
+  [#16697](https://github.com/angular/angular.js/issues/16697),
+  [#16699](https://github.com/angular/angular.js/issues/16699))
+
+
 <a name="1.7.4"></a>
 # 1.7.4 interstellar-exploration (2018-09-07)
 

README.md

@@ -14,9 +14,9 @@ piece of cake. Best of all? It makes development fun!
 
 --------------------
 
-##### AngularJS will be moving to Long Term Support (LTS) mode on July 1st 2018: [Find out more](https://docs.angularjs.org/misc/version-support-status)
+**On July 1, 2018 AngularJS entered a 3 year Long Term Support period:** [Find out more](https://docs.angularjs.org/misc/version-support-status)
 
-##### Looking for the new Angular? Go here: https://github.com/angular/angular
+**Looking for the new Angular? Go here:** https://github.com/angular/angular
 
 --------------------
 

docs/content/api/index.ngdoc

@@ -5,7 +5,7 @@
 # AngularJS API Docs
 
 <div class="alert alert-warning">
-**AngularJS will be moving to Long Term Support (LTS) mode on July 1st 2018.**: [Find out more](misc/version-support-status).
+**On July 1, 2018 AngularJS entered a 3 year Long Term Support period:** [Find out more](misc/version-support-status).
 </div>
 
 ## Welcome to the AngularJS API docs page.

src/ng/directive/ngClass.js

@@ -125,6 +125,8 @@ function classDirective(name, selector) {
   }
 
   function toClassString(classValue) {
+    if (!classValue) return classValue;
+
     var classString = classValue;
 
     if (isArray(classValue)) {
@@ -133,6 +135,8 @@ function classDirective(name, selector) {
       classString = Object.keys(classValue).
         filter(function(key) { return classValue[key]; }).
         join(' ');
+    } else if (!isString(classValue)) {
+      classString = classValue + '';
     }
 
     return classString;

test/ng/directive/ngClassSpec.js

@@ -88,6 +88,12 @@ describe('ngClass', function() {
     expect(element.hasClass('AnotB')).toBeFalsy();
   }));
 
+  it('should not break when passed non-string/array/object, truthy values', inject(function($rootScope, $compile) {
+    element = $compile('<div ng-class="42"></div>')($rootScope);
+    $rootScope.$digest();
+    expect(element.hasClass('42')).toBeTruthy();
+  }));
+
   it('should support adding multiple classes via an array mixed with conditionally via a map', inject(function($rootScope, $compile) {
     element = $compile('<div class="existing" ng-class="[\'A\', {\'B\': condition}]"></div>')($rootScope);
     $rootScope.$digest();