Fix regressions

src/style_manager/model/Layers.js

@@ -19,7 +19,8 @@ module.exports = Backbone.Collection.extend({
   },
 
   getSeparator() {
-    return this.property.get('layerSeparator');
+    const { property } = this;
+    return property ? property.get('layerSeparator') : ', ';
   },
 
   /**

test/specs/style_manager/index.js

@@ -155,6 +155,7 @@ describe('StyleManager', () => {
             }
           ]
         });
+        obj.onLoad();
       });
 
       afterEach(() => {

test/specs/style_manager/model/Models.js

@@ -155,7 +155,7 @@ module.exports = {
 
       test('parseValue with function and functionName', () => {
         obj = new Property({ functionName: 'fn' });
-        const result = { value: 'testValue' };
+        const result = { value: 'testValue', functionName: 'fn' };
         expect(obj.parseValue('fn(testValue)')).toEqual(result);
         expect(obj.parseValue('fn(testValue')).toEqual(result);
       });
@@ -194,7 +194,7 @@ module.exports = {
           units: ['px', 'deg'],
           functionName: 'test'
         });
-        const result = { value: 55, unit: 'deg' };
+        const result = { value: 55, unit: 'deg', functionName: 'test' };
         expect(obj.parseValue('test(55deg)')).toEqual(result);
       });